Here’s my Q&A column from the WSJ this week — and if you have any questions for me, you can tweet them to @danariely with the hashtag #askariely, post a comment on my Ask Ariely Facebook page, or email them to AskAriely@wsj.com.

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Dear Dan,

My neighborhood recently suffered a horrible tragedy: A house fire, started by a faulty appliance, broke out in the middle of the night and killed two young children. I don’t know the parents, but their family has many parallels with mine: the parents’ jobs, the kids’ ages, the friends we have in common and, most importantly, the fact that we also don’t have smoke alarms in our house. I haven’t bought one for the usual list of reasons: I’m so busy, no one said I have to get one, I don’t know what kind to get, I never see them in shops anyway and so on. So how can I get myself—and everyone I’ve ever met—to buy a smoke detector?

—Tanya 

It would be nice to think that everyone will realize the important steps they need to take for basic safety and just take them. But it’s also extremely unlikely. For example, we already know that texting and driving is terribly dangerous and that overeating is bad for us, but we still let our eyes drift to our phones when we’re in traffic and we still order that burger with fries.

I also suspect that something as seemingly simple as installing a smoke detector is more difficult and confusing than we might think: There are many options, they need batteries, they may need to be installed in a tricky spot, we are not sure which brand will fit the bracket we have at home, and so on. And while none of these concerns are particularly substantial, they do increase our procrastination and indecision—leaving us in homes without functioning smoke alarms.

This is why I think that cases such as this call for some type of government regulation— something that will not assume that we’ll act in our best long-term interest and instead will make us do the right thing.

In the meantime, I suspect that many people reading this right now are realizing that they need to get smoke alarms of their own or change the batteries—and I also suspect that this feeling will last about 20 minutes and then be replaced by other urgent thoughts. So if you (yes, you) are one of these people, stop now (yes, now), go online, order that smoke detector, get those batteries and tell your household that you promise to install it by the end of the week.

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Dear Dan,

I recently attended a lecture by a well-known academic, and I was amazed and baffled by his inability to communicate even the most basic concepts in his field of expertise. How can experts be so bad at explaining ideas to others? Is this a requirement of academia?

—Rachel 

Here’s a game I sometimes play with my students: I ask them to think about a song, not to tell anyone what it is and tap its beat on a table. Next I ask them to predict how many other students in the room will correctly guess the song’s name. They usually think that about half will get it. Then I ask the rest of the students for their predictions—and no one ever gets it right.

The point is that when we know something and know it well, it is hard for us to appreciate what other people understand. This problem is sometimes called “the curse of knowledge.” We all suffer from this affliction, but it’s particularly severe for my fellow academics. We study things until they seem entirely natural to us and then assume that everyone else easily understands them too. So maybe the type of clumsiness you heard is indeed something of a professional requirement.

See the original article in the Wall Street Journal here.

Here’s my Q&A column from the WSJ this week — and if you have any questions for me, you can tweet them to @danariely with the hashtag #askariely, post a comment on my Ask Ariely Facebook page, or email them to AskAriely@wsj.com.

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Dear Dan,

During a recent trip to Los Angeles, I stopped by a coffee shop offering a very expensive coffee called kopi luwak, or civet coffee. I asked about the steep price, and the barista told me the story of the special process required to make this coffee: A catlike Indonesian animal known as a civet eats coffee cherries and then poops out what are basically beans. People then collect these “processed” beans and use them to make a highly unusual brew that’s said to be smoother than its journey. It can sell for hundreds of dollars per pound. I was curious but not interested (or brave) enough to buy it—let alone drink it. Can you explain why are people willing to pay for this?

—Chahriar

First, I think you made a mistake. You should have paid up and tried a cup—in part because you are still clearly curious about it, in part because it would have made a much better story (and what are a few dollars compared to a good story?). So next time you pass by a coffee place with kopi luwak, try it—maybe even get the double shot with hair and all the trimmings.

As for civet coffee’s quality: The promotional material that I found says that civets know how to pick the best coffee beans and that their digestive systems ferment the beans, reducing their acidity and providing a much better coffee. (I have no idea how this works, but the story caught my curiosity too.)

So why are people willing to pay for so much for civet coffee? It’s probably for the novelty and the story—and because the amount (and type) of labor involved is clearly so much higher than your average cup of java. People are generally willing to pay more for something that required more effort to produce even if the product itself is not better—and civet coffee sounds like a prime example of this effort-based-pricing principle.

Finally, I wonder how much people would be willing to pay had the beans passed through not an Indonesian animal but an American human. My guess: That’s too strong a brew for any of us.

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Dear Dan,

Are financial advisors a wise investment? Mine charges me 1% each year for all my assets under their management. Is it worth it?

—Allan

It is hard to know for sure. But the fact that many financial advisers have different hidden fees suggests to me that they themselves don’t think that people would pay if they charged for their services in a clear and upfront way.

To help you think about this question in your own life, let’s contrast two cases: In case one, you are charged 1% of your assets under management, and this amount is taken directly from your brokerage account once a month. In case two, you pay the same overall amount, but you send a monthly check to your financial adviser.

The second case more directly and clearly depicts the cost of your financial adviser, providing a better frame for your question. So, put yourself in the mindset of the second case, and ask yourself if you would pay directly for these services. If the answer is yes, keep your financial adviser; if the answer is no, you have your first action plan for the New Year.

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Dear Dan,

Every year, when Christmas comes, I feel an obligation to send Christmas cards to everyone I know, and every year, the number of cards I send gets larger and larger. It is now officially getting out of hand. Can I switch to sending cards only to my really close friends?

—Holly 

It is fine to send cards only to your good friends. I don’t think anyone left off the list will be offended, and you will also reduce their feeling of obligation to send you a card next year. And if you really want to eliminate the Christmas-card frenzy, there is always Judaism.

See the original article in the Wall Street Journal here.

Here’s my Q&A column from the WSJ this week — and if you have any questions for me, you can tweet them to @danariely with the hashtag #askariely, post a comment on my Ask Ariely Facebook page, or email them to AskAriely@wsj.com.

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Dear Dan,

Delta Air Lines recently announced plans to start distributing thousands of Microsoft Surface 2 tablets to its pilots to spare them lugging around heavy documents, maps and flight plans. As a passenger, I always suspected that flight attendants sometimes ask us to turn our gadgets off not because they might harm the plane’s instruments but because some airline employees get a kind of twisted satisfaction from making passengers suffer a bit more. What do you think? Is the whole issue of turning electronics off just a way to make the passengers realize that the flight attendants are really in control?

—Adam 

In fairness, the unpopular (and rapidly fading) ban on using personal electronics during takeoff and landing was a Federal Aviation Administration regulation, not a policy by the airlines. Even so, the logic of turning off iPads and Kindles while taxiing was never clear to me either, and the joy that some flight attendants took in commanding passengers to turn their devices off could make one suspect that your “control theory” is right. Nevertheless, I suspect that this was just one more regulation set up without much thought that the poor flight attendants were forced to follow—and that in fact, they most likely suffered much more from having to enforce a rule that annoyed passengers and lacked logic many times a day.

I do worry about another aspect of your question: making airplanes too reliant on tablet technology. A crash of the less dangerous type could translate into a more harmful one.

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Dear Dan,

I recently had a massage when I was very tired, and I fell asleep repeatedly. Every time I dozed off, the masseuse moved me particularly vigorously and woke me up. This left me a bit embarrassed, and it wasn’t fun to be woken up so many times in one hour. What should the masseuse have done—let me sleep through the massage, or woken me up to experience it?

—Merve 

The person giving you the massage was wrong. More generally, this is really a question about different types of pleasure and their building blocks. In general, you can think about the pleasures you get from anticipating a massage, experiencing it, and remembering it after the fact.

The interesting thing about remembered and anticipated pleasure is that they capture some aspects of the experience—but not all of them. That’s why, for example, you might remember an experience that was great for 15 minutes as better than an experience that was great for the first 15 minutes and then merely good for 15 more. In essence, the longer experience had more goodness in it (30 minutes), but the remembered pleasure wasn’t as large because it also involved some less exciting moments.

I suspect that the masseuse wanted you to have more moments in which you experienced the massage—but by doing so added some less pleasurable parts and decreased your remembered pleasure, which will also decrease the anticipatory pleasure you’re likely to feel before your next session on the table.

This lesson, by the way, applies to many other domains of life. Think about a presentation to clients, a dinner party, or a discussion with a friend—it’s the quality, not the quantity, which influences our remembered and anticipated pleasures.

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Dear Dan,

My kids are spending much of their time on social networks such as Facebook. Are they really being social with their friends or just wasting time?

—Dafna 

Here’s my test for real friendship: Would your friends bail you out of jail if you needed them to? My sense is that spending face-to-face time with friends is likely to increase the likelihood of bail, while following someone’s status updates won’t. If your kids aren’t increasing their odds of getting real help when they need it, they probably aren’t being social in a meaningful way.

See the original article in the Wall Street Journal here.

Here’s my Q&A column from the WSJ this week — and if you have any questions for me, you can tweet them to @danariely with the hashtag #askariely, post a comment on my Ask Ariely Facebook page, or email them to AskAriely@wsj.com.

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Dear Dan,

I waste about two hours each day playing stupid games on my iPhone. It feels so innocent, but it actually makes me lose focus at work and takes up time I should be spending with my wife and kids. Do you have an idea for how I can ditch this bad habit?

—Arianna

One way to fight bad habits is to create rules. When you start a diet, for example, you can set yourself a rule such as “I won’t drink sugary beverages.” But to be effective, rules need to be clear and well defined. For example, a rule such as “I will drink only one glass of wine a day” is unlikely to work. With this type of rule, it is not clear what size of glass we are talking about, or if we can drink more today and reduce our drinking next week. In essence, if the rule is not clear-cut and unequivocal, we are likely to break it while deceiving ourselves that we are actually following it.

In your case, you could decide that, from now, on you won’t be playing the iPhone between 6 a.m. and 9 p.m. And to help you follow this rule, you should let your loved ones know. Or you could set up game bans for weekdays or working hours. Good luck.

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Dear Dan,

I am in middle school, and there is one topic in school I really love and one I really dislike. There is also one teacher I really love and one teacher I am not very excited with. Would I be better off if the teacher I love taught the topic I love, and the duller teacher taught the topic I dislike? Or would I be better off if the teacher I love taught the topic I dislike, and the duller teacher taught the topic I love?

—Tima

What you are really asking me about is the accumulation of pleasure and pain. On the one hand, you might argue that having one class with a great teacher and a great topic, and one class with nothing going for it, would give you at least one class to look forward to. You might also argue that, if a class isn’t going to be good, it doesn’t really matter how bad it is—adding a good teacher to a bad topic, for example, wouldn’t help much.

On the other hand, you might argue that a class with a bad teacher and a bad topic is going to be too much to bear. In this case, the combined pain might pass your tolerance threshold and color the entire semester.

I should say, first, that I am delighted you like some of your teachers and topics, and I don’t want you to stop thinking of school as joyful. But I do think that the mixing approach would be better for you.

I suspect that having a class with a bad teacher and a bad topic will be too much for you to handle. And I suspect that in the class with the teacher you love and the topic you don’t, you will learn to focus on the teacher and pay less attention to the topic, while in the class with the teacher you dislike and the topic you love, you will learn to focus on the material and pay less attention to the teacher.

I wish you many years of joyful (or at least not torturous) learning.

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Dear Dan,

What do you think is the best psychological approach to getting over a girlfriend? Should you cut off seeing her completely? Continue getting together for coffee, etc.?

—Jason

I suggest that you cut it off completely. Meeting an old girlfriend over and over, while wondering if you should have ended things or not, is just going to prolong the pain—and without any real value.

See the original article in the Wall Street Journal here.

Here’s my Q&A column from the WSJ this week — and if you have any questions for me, you can tweet them to @danariely with the hashtag #askariely, post a comment on my Ask Ariely Facebook page, or email them to AskAriely@wsj.com.

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Dear Dan,

A strange thing happened to me a few days ago. One of my employees came into my office holding a few lottery tickets and asked, “You in? It’s 45 bucks.” I never play the lottery, but I felt an inexplicable urge to say yes–and I did. Was I being grossly irrational?

—Itay 

You were indeed irrational, but in a very common way. Usually, when you are considering whether or not to buy a lottery ticket, you take into account how your life would change if you won and contrast this with the cost of the ticket and the slim chance of winning. After making this quick computation, you decide not to buy a ticket.

But when another person asks you to “go half” with them on a tickets that they’ve already purchased, another factor comes into play: regret. Now you can’t help thinking how you would feel if that other person won. You quickly conclude that it would make you feel terrible and you also realize that you would keep on thinking about this forgone fortune for a very long time.

I think that too many people are currently losing too much money on various lotteries (often state sponsored), and I wouldn’t want more people to keep losing money this way. But if I were looking for a way to get more people to gamble, I would certainly try to play on our capacity for regret.

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Dear Dan,

On a recent flight, the attendants declared it was “Breast Cancer Awareness” month and asked for donations from the passengers for this worthwhile cause. I give to a multitude of breast-cancer organizations, but this approach offended me. Maybe if the airline had offered to match my contribution dollar for dollar it would have made me feel we were partnering in this effort, but the way it was handled just annoyed me. Is it just me or were they doing this the wrong way and actually hurting the cause they are trying to help?

—Rob 

I suspect that many companies trying this approach to corporate responsibility don’t get much of a boost from it in terms of internal morale or customer loyalty. It turns out that companies get the most credit for donating to charity in two cases: One is when they give first and then tell the customers, “Look, we’ve already given on your behalf, now you can contribute as well.” The second is when they empower their customers to give themselves (“here is a $5 voucher for you to give to any organization you value”). The approach you describe, where the company simply says, “We have a charity that we like and want you to give to it,” is ineffective in every way.

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Dear Dan,

It seems to me that any reading of social science research implies that we are all less capable in making our own decisions and that as a consequence we need help. Yet, it seems that Americans are emotionally against any hint of paternalism. Any idea how we can overcome this barrier?

—Tom

I agree with your general position. I think that part of the problem is that, while we see irrationalities and bad decision-making in those around us, we don’t see these mistakes as readily in our own behavior. Because of this partial blindness, we are not as interested in limiting our freedom to make our own stupid decisions. I’m not sure what we can do to fix this part of the problem. But perhaps we can think about how to market paternalism in a better way. As a first step, I would change the term and call it maternalism. After all, who could object to listening to a mother figure?

See the original article in the Wall Street Journal here.

Here’s my Q&A column from the WSJ this week — and if you have any questions for me, you can tweet them to @danariely with the hashtag #askariely, post a comment on my Ask Ariely Facebook page, or email them to AskAriely@wsj.com.

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Dear Dan,

I was thinking about buying a Tesla electric car, and I was very excited about it, but given the recent news, I am not sure this is a wise decision. Is it too risky?

—Karl

Indeed, earlier this month a Tesla Model S drove over a large metal object, and the object punched a hole through the plate protecting the battery, and the battery pack caught on fire. But this is only one part of the story. In August, the model S received five stars in all test categories—an unusually high rating—by the National Highway Traffic Safety Administration. In the two days after we all learned about the crash test ratings, the stock of the company went up by 2%.

We now need to add one more data point to this body of evidence: The fire happened on Oct. 1. The share price fell by 10% over the next two days. By the way, this means that the effect of one small piece of bad news can be four times more effective than good news based on much more data. (A rare downgrade of the stock by the R.W. Baird brokerage from “outperform” to “neutral” probably also contributed to the drop.)

Elon Musk, Tesla’s CEO, pointed out in a statement Oct. 4 that no one was hurt, that the car warned the driver to pull over, and that gas cars are in no way safer. After the statement, the stock price increased by 3%, making the overall losses 6.2% from the day before the accident.

From a psychological perspective, this overreaction to one very salient (and very sad) accident is nothing new. It is a consistent way that we react to salient news, and it is perfectly irrational.

And after all of this, my suggestion to you? If you had decided to buy a Tesla before this accident, get one now—because the event didn’t add much to the information you used to make your original decision. In fact, given that other people might have an irrational fear of buying a Tesla, maybe the prices will go down a bit.

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Dear Dan,

Why do people love to write to-do lists?

—Joe 

I suspect there are rational and irrational reasons for the very large amount of list-making activity we see around us. On the rational side, lists help us with faulty memory and allow us to share tasks with other people simply and efficiently. On the irrational side, making lists and checking items off these lists give us the false sense that we are actually making progress. The term for this by the way is “structured procrastination.” It’s an attempt to capture the momentary feeling that we are progressing—whereas in fact when we look back at the end of the day on what we achieved, we realize that we did not get much done. I also suspect that all the apps that help us make lists and then make it fun for us to check things off are reducing our collective productivity, by replacing real work and focus with structured productivity.

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Dear Dan,

I am always upset by bad news online when I turn on my computer. But negative news is pervasive, so what can I do to make myself feel better and get down to work immediately?

—Liz

One approach is to start each day with the most depressing set of news around for about five minutes and then move to the regular news. The idea here is that contrast between the highly depressing and the regular will make you feel good in comparison.

See the original article in the Wall Street Journal here.

Here’s my Q&A column from the WSJ this week — and if you have any questions for me, you can tweet them to @danariely with the hashtag #askariely, post a comment on my Ask Ariely Facebook page, or email them to AskAriely@wsj.com.

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Dear Dan,

Often when I meet with a group of my closest friends, the discussion goes something like this: “Where do you want to go?” “Not sure.” “Where do you want to go?” “Not sure.” Etc. These discussions are frustrating and waste time. Any advice on how to move them forward and get to a decision faster?

—Matthew 

When someone asks “What do you want to do tonight?” what they often are saying implicitly is: “What is the most exciting thing we can do tonight, given all the options and all the people involved?”

The problem is that figuring out the best solution is very difficult. First, we need to bring to mind all the alternatives, next our preferences and the preferences of the people in the group. Then we have to find the one activity that will maximize this set of constraints and preferences.

The basic problem here is that, in your search for the optimal activity, you are not taking the cost of time into account, so you waste your precious time asking “What do you want to do?”—which is probably the worst way to spend your time.

To overcome this problem, I would set up a rule that limits the amount of time that you are allowed to spend searching for a solution, and I would set up a default in case you fail to come up with a better option. For example, take a common good activity (going to drink at X, playing basketball at Y) and announce to your friends that, unless someone else comes up with a better alternative, in 10 minutes you are all heading out to X (or Y).

I would also set up a timer on your phone to make it clear that you mean business and to make sure that the time limit is kept. Once the buzzer sounds, just start heading out to X (or Y), asking who wants to come with you and telling everyone else that you will meet them there. After doing this a few times, your friends will get used to it and perhaps bring an end to this wasteful habit.

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Dear Dan,

I’d like to understand something I see in my own life and in billion-dollar companies: the switch from aiming to succeed to aiming not to fail. You see this in companies such as Microsoft, but even the National Aeronautics and Space Administration went from the ambitious 1960s-’80s era to its current conservative program. What can we do to overcome this problem?

—Alex

Assuming this is indeed a generalized pattern (and it would be interesting to collect data on the question), it might be a simple outcome of the endowment effect: basically, once we own something, we get used to it and are very reluctant to see it go away. When you are just starting out, you have nothing, so you look at potential gains and losses to some degree on an equal footing. But once you experience some success, you start thinking more carefully about what you have, and you don’t want to give it up, so you become much more conservative. In the process, you give up the things that made you successful from the get-go. Nor are companies alone in this: I suspect that the tendency to switch to a do-nothing defensive posture is just as common in the behavior of our public officials and governments.

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Dear Dan,

Someone once said to me that marriage is like betting someone half of everything you own that you’d love him or her forever. Do you agree?

—Shane

From the perspective of an outside observer, there are some things in life that can be described as a bet or a gamble—while for the people directly involved, looking at it that way will be a very bad idea. Marriage is one of these cases. It might be fun and interesting to think about other peoples’ marriages in such terms, but don’t be tempted to think about your own relationship this way. And certainly don’t mention these odds to your significant other.

See the original article in the Wall Street Journal here.

Here’s my Q&A column from the WSJ this week — and if you have any questions for me, you can tweet them to @danariely with the hashtag #askariely, post a comment on my Ask Ariely Facebook page, or email them to AskAriely@wsj.com.

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Dear Dan,

I’m turning 30 in December, and I want to have a “nontraditional” celebration. I’m thinking about re-creating some economics experiments at my party.

Here’s the plan: Lots of alcohol and yummy appetizers at a fancy place here in Dallas. Computers scattered across the room with small apps, each running a different experiment. After all, how many parties do you go to where you get to have fun, have too much to drink and learn something about economics? Any advice?

—Virginia

I really love your idea—and here is a suggestion for an experiment relating to dishonesty. Give each of your guests a quarter and ask them to predict whether it will land heads or tails, but they should keep that prediction to themselves. Also tell them that a correct forecast gets them a drink, while a wrong one gets them nothing.

Then ask each guest to toss the coin and tell you if their guess was right. If more than half of your guests “predicted correctly,” you’ll know that as a group they are less than honest. For each 1% of “correct predictions” above 50% you can tell that 2% more of the guests are dishonest. (If you get 70% you will know that 40% are dishonest.) Also, observe if the amount of dishonesty increases with more drinking. Mazel tov, and let me know how it turns out!

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Dear Dan,

My daughter started dating a lazy, dumb guy. How can we tell her gently that he is wrong for her without preaching to her, causing her to ignore us or go against our advice?

—Concerned Mother

It seems that you are experiencing the same reaction most mothers around the world have toward their daughters’ boyfriends. Let’s assume, for the sake of argument, that you are, in fact, correct, and that your daughter’s new boyfriend really is dumb, lazy and up to no good. Nevertheless, don’t tell your daughter your opinion and instead ask her questions. Naturally, people tend not to ask themselves certain questions. But if someone else asks them, these questions get planted in their minds, and it is hard to keep from thinking about them. So thoughtful questions can make people think differently about what they want and how they view the world around them.

For example, you can ask, “How do you and your boyfriend get along? Do you ever fight? What do you love about him? What do you like less about him?” I admit it’s a bit manipulative, but I hope it will get her to think about her relationship in more depth. And maybe she will reach the same conclusions you have.

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Dear Dan,

My wife-to-be really wants to get a two-carat ring, but I’d rather get a smaller ring and spend the rest of the money for future expenses—house, wedding, etc.

Her view is that most of her friends have big rings, plus she’s been dreaming about this for a long time. What do you think about this irrational behavior? Any advice?

—Jay

First, there is a difference between irrational and difficult to understand, and for sure it is irrational to call your future wife irrational in public. If you get her a ring, realize that comparison to her friends is part of the game you are buying into and try to get her a ring that will make her happy with this comparison.

At the same time, what if you could switch to a different jewelry category—maybe a wedding necklace or bracelet? In this case comparison will not be as clear, and you could probably get away with spending much less.

Finally, has it occurred to you that she may want this so much because you are so against it?

See the original article in the Wall Street Journal here.

Here’s my Q&A column from the WSJ this week — and if you have any questions for me, you can tweet them to @danariely with the hashtag #askariely, post a comment on my Ask Ariely Facebook page, or email them to AskAriely@wsj.com.

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Dear Dan,

From time to time, people around me discuss a book they have read recently. While I know the book well, and I want to participate in the conversation, I hesitate because I listened to the book on tape. My first question is why am I embarrassed to say that I listened to the book? My second question is what can I do about it?

—Paula

We learn how to listen and comprehend at a young age and therefore we don’t really remember how difficult it was for us. On the other hand, we learn how to read and write at a later age and we all remember the difficulty of the early struggles with reading and writing. Because of that, people associate greater difficulty with reading than listening. As a consequence, we take greater pride in reading than listening.

My first suggestion is that you realize that it isn’t necessarily the case that reading is more difficult. It’s just that we forget how difficult it is to learn to comprehend. When I got your question I purchased an audio book and I listened to it on a long flight–and for what it is worth, I find it is harder to focus when listening to a book than when reading one.

A second suggestion is that you to find a different word to describe your experience. For example, for books you loved, maybe you can say: “I inhaled that book.” For more difficult books, maybe you can say: “I struggled with it,” or some other phrase.

If these don’t work, perhaps it is time to change the meaning of the word “read.” Maybe we should acknowledge that today there are many ways to get information — audiobooks being one of them. This might seem dishonest, but you might be able to start a revolution, and help lots of people who listen to audiobooks feel more comfortable with what they’re doing. Good luck!

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Dear Dan,

I noticed that when I drive around the block looking for parking I spend a lot of time too far away from my destination (I live in Chicago, and hate the cold), so instead, I just wait until somebody leaves and take the spot. It proved to be more efficient, but my friends can’t seem to stand it, and I can’t do it when I’m not alone in the car. My question is why my friends find in intolerable waiting for someone to leave.

—Danny 

The phenomenon you’re encountering is aversion to idleness. There was a story a while ago about an airline that tried to optimize which carousel that the luggage would come out of. There was an engineer with this airline that realized that some carousels were close to some gates, and others were close to other gates. He wrote an algorithm to try to figure out which carousels to send the luggage to so that it would be closest to where the plane was landing. Before this algorithm was created, travelers would get out of the plane, walk for a while and get to the carousel. Sometimes it was such a long walk that their luggage was waiting for them already, and they would pick it up and go home. In the new system, the carousel was much closer and people would walk a little bit, find the carousel and wait for their luggage. People hated this new system because they were standing in one place to wait for their luggage. This idleness was so unpleasant that people complained and the airline rejected this algorithm. My understanding is that they have not gone the whole way in the reverse and tried to get the luggage in the farthest carousel possible, but maybe it is something they are still working on.

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Dear Dan,

Many people justify evading paying for public transportation by rationalizing that “public transportation services aren’t value for money,” that “it’s a victimless crime,” and that “as a tax paying passengers, we’ve already paid for my journey once.” Do you have any advice on counteracting these rationalizations?

—Julian

Make these people buy some shares of the public transportation company.

See the original article in the Wall Street Journal here.

Here’s my Q&A column from the WSJ this week — and if you have any questions for me, you can tweet them to @danariely with the hashtag #askariely, post a comment on my Ask Ariely Facebook page, or email them to AskAriely@wsj.com.

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Dear Dan,

I just got back from a trip to Europe, and although I knew that Europeans were much less obese than Americans, it was still shocking to see the difference. It is also not true that they don’t have fast food joints. Can you shed some light on these national differences? 

—Alvin

Some think that the key factor is the European diet: more homemade food and less prepackaged food, smaller portion sizes, less sugar and corn syrup, etc. I have no doubt that there is some truth to this, but I would propose that our differences in weight also have to do with the fact that Europeans use kilograms while Americans use pounds.

Here is my proposed logic, using me as an example: I weigh 170 pounds, which is also 77 kilograms (well, the truth is that right now I might be closer to 174 pounds, but my real weight is 170). Depending on the time of day and what we eat, our weight fluctuates by a pound or more, as most of us know. This kind of fluctuation lets us convince ourselves that when the scale shows 172, our real weight is still 170, even if it has not shown 170 for a while.

If one day our weight is 174, would we say to ourselves “I am gaining weight, and I need to change what I eat” or would we be able to justify this as part of the random fluctuation around our supposed real weight of 170? By contrast, if we were using the kilogram system, the fluctuations would be much smaller, and when we learned that we were one kilogram heavier, we might act on this change more quickly.

My suggestion: Switch to kilograms (and while we’re at it, maybe we can move to the metric system more generally).

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Dear Dan,

There are people in my office who have a hard time focusing for even 20 minutes on their jobs. Nevertheless, they seem perfectly capable of exercising for long stretches, and they are quite persistent in that. Can you explain this contradiction?

—Michael

This might actually not be a contradiction but rather, as I learned recently, two faces of the same mechanism. A few weeks ago, I flew to California for some meetings. I left home at 4:30 a.m. and got to San Francisco at 10 a.m. I had a few meetings, and by 5 p.m. was exhausted. I had a lot of work-related tasks and was determined to get at least some of them done, but I felt devoid of energy. So I went for a run.

Ordinarily, I go for a run maybe once every 10 years. But this run was fantastic! I ran a bit, walked a bit, listened to music along the way. It was challenging, and I ran out of breath, but in no way was it even close to the mental exhaustion of doing the things I was supposed to work on.

Here is my new understanding: I think that people who either don’t enjoy what they’re doing for work or don’t have the mental stamina to focus on it can take long breaks for exercise. On top of that if your co-workers took a two-hour book or movie break, they would be seen as selfish slackers, wasting time. But because society tells us that exercising is good for our health, it is a perfectly good excuse to escape work. Now that I have discovered this way to take time for myself and not feel guilty about it, I am going to do more of it.

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Dear Dan,

The health-care benefits provided by my employer have just been updated to include a hefty monthly surcharge to smokers. I put little effort into quitting smoking, although I know this is the right thing to do. This smoking tax might motivate me to quit, but at the same time it infuriates me that my employer has the power to charge me for smoking. What is your opinion?

—Anonymous 

The smoking rate in the U.S. is about 20%, and companies that add such smoking surcharges usually find that the smoking rate drops overnight to less than 10%. Or, more precisely, they find that the smoking surcharge dramatically reduces the number of people who say that they smoke.

See the original article in the Wall Street Journal here.