The telephone is an example of a product with network externalities

The word "fiat" is

A) used to describe today's money because it is money set by law. B) used to describe money from when Kings ruled by decree or fiat. C) the term used to define the concept of barter. D) another word to mean the "double coincidence of wants." E) Latin for "backed by gold."

Perfect competition is a market structure

A) in which any firm would have serious impediments to entry or exit. B) in which individual buyers and sellers have no effect on the market price. C) resulting from individual firms selling highly differentiated products. D) where there is significant regulation and markets are always efficient.