Final answer:
A business's key feature is that it facilitates an exchange of goods and services, often using money as a universally accepted medium to improve efficiency over bartering systems.
Step-by-step explanation:
The key feature of a business is that it facilitates an exchange of goods and services. This exchange is central to the function of markets and allows for the establishment of prices and value attribution to various products. Furthermore, the concept of money as a universally accepted medium drastically improves efficiency over barter systems by eliminating the need for a double coincidence of wants.
Instead of requiring that two parties each have what the other wants, money allows for a more fluid and dynamic exchange of goods and services. In a capitalist society, market exchanges are built on this principle, fostering competition, voluntary exchange, and economic freedom, which can lead to wealth generation within a country.