From an Economist's Point of View,"market Exchange" Is Defined By

From an economist's point of view,"market exchange" is defined by:

A) the purchase of goods in a marketplace.
B) the buying and selling of goods and services whose value is determined by supply and demand.
C) the role of middlemen who bring buyers and sellers together.
D) face-to-face bargaining for goods and/or services.
E) the role of large multinational corporations,using a formal stock exchange.