Imagine going out to eat and not getting a bill, but instead being told to pay whatever you think the meal was worth. Clark says he'd personally feel uncomfortable, but a handful of eateries across the nation have this type of business model. There's one in Salt Lake City that opened in 2003 and has been profitable since 2005. The Wall Street Journal reports that customers leave an average of $10 a meal as compensation. But they're also free to leave just a couple of bucks or nothing at all! Similar establishments exist in the mountain states and Washington State too. One restaurant started out with a traditional business model and then switched over to the honor system. But the business had to change back because customers were so uncomfortable not knowing how much to pay. Paying on the honor system is also used in some transit systems abroad. But it's probably more viable in the restaurants. After all, someone may love a meal and pay a large amount that covers a few patrons who underpaid. But who's going to pay more than the suggested fare to ride a bus or train?