 It's a way to funnel more money to the workers without the company having to foot the bill. Starbucks is an interesting example. They unveiled those tip prompts on their credit and debit card machines about a year and a half ago. And they say that about half of customers are leaving a tip in those instances. That has to be far more than the percentage that was putting bills or coins in the old-fashioned tip jar. And it's really emblematic of this whole thing.