Doling out 15 percent of the check to the waiter is standard, but how much should you tip cab drivers and hairdressers?  Today’s Please Explain is all about tipping. Milla Bloch and Diane Gottsman explain how much to give, to whom, and where tipping comes from.

Do you have different tipping methods based on service? Do you tip a cab driver the same way you tip a waitress or a hairdresser?

Current and former waiters: do you tip more generously than others?