If you're paying a premium to defer payment
well it depends what situation and you pay for that product
The American dollar, the Euro, the yen, the pound, rubles, and peso.
Google search for "expert answers" or "human guides" and read terms of service some sites: About.com, Justanswer.com
Interest.
In home buying it's called points. 1 point = 1% of the loan amount, paid up front. ( you are pre paying interest )