Final answer:
Money serves as a medium of exchange, a measure of value, and a store of value, making trade more efficient in modern advanced economies.
Step-by-step explanation:
Money is what people regularly use when purchasing or selling goods and services. It serves as a medium of exchange, a measure of value, and a store of value. Barter exchange, where goods or services are directly traded, is inefficient because it requires a double coincidence of wants. Money, on the other hand, simplifies and facilitates trade in modern advanced economies.