Ask Ariely: On Tipping, Attachment, and Hoarding

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. ______________________________________________________ Dear Dan, I work as a waiter in…