Explanation:

A marketing exchange is what happens any time two or more people trade goods or services. In marketing theory, every exchange is supposed to produce "utility," which means the value of what you trade is less than the value of what you receive from the trade.
Marketing theorists consider exchange to be the central concept without which there would be no such thing as marketing. For an exchange to happen, both parties have to have something of value for each other. For instance, a man visiting a coffee shop might have enough money to buy a cup of coffee while the cafe has the coffee. Both parties must be able to communicate with each other, and both must want to exchange something and be able to do so.