The basic macroeconomic sector containing the private, profit-seeking firms in the economy that combine scarce resources into the production of wants-and-needs satisfying goods and services. The key economic function of the business sector is the production of goods and services. The three basic types of business organizations that comprise the business sector are proprietorship, partnership, and corporation. This is one of the four macroeconomic sectors. The other three are household sector, government sector, and foreign sector. You might want to check out the key role that the business sector plays in the circular flow.