"accepting...I.O.U.'s" One of the coffee shops I frequent also accepts IOUs, plus they do one other thing: you pay as you leave, not when you get your coffee.

"accepting...I.O.U.'s" One of the coffee shops I frequent also accepts IOUs, plus they do one other thing: you pay as you leave, not when you get your coffee. Now, this has two benefits: First, means that the barista has to keep track of things...they have to actually have a relationship and interaction with the customer. That's very positive. Second, it means that I often go get a second cup, or a pastry, because I haven't closed out my bill yet.