Take that same good, and perform the service of actually brewing it for a customer, in a corner diner, in a bodega, a kiosk somewhere, you get 50 cents, maybe a buck per cup of coffee.
Uzmite taj isti proizvod, i dodajte uslugu pripremanja za klijenta, u zalogajnici, negdje na kiosku, i dobit ćete 50 centi, možda i dolar za šalicu kave.