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,

A chain of coffee shops in Israel, where I live, had tremendous success charging a flat price of five shekels (about $1.35) for coffee and other items on its menu. People would get coffee and often a muffin or something else to eat. Now the chain has raised the flat price at its cafes to six shekels, and suddenly my friends don’t go anymore. Why?

—Ron