Final answer:
Money is a human universal that serves as a medium of exchange, a measure of value, and a store of value. It is used regularly in transactions for goods and services. Without money, economies would rely on barter, which is inefficient.
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. Without money, economies would rely on the inefficient barter system, which requires a double coincidence of wants.