Final answer:
The business function that knows customer purchasing behavior and pricing willingness is Marketing. Marketing is critical for tailoring products and services to market demands. Money functions as a medium of exchange, a unit of account, a store of value, and a standard of deferred payment to facilitate economic transactions by removing the requirement for a double coincidence of wants.
Step-by-step explanation:
The business function that knows who buys the company's products and services and how much they are willing to pay is Marketing (A). Marketing teams analyze market trends, consumer behavior, and competitors to identify target audiences and determine optimal pricing strategies. They are instrumental in understanding customer needs and preferences, which helps in tailoring products and services to meet market demands. Money serves several essential functions in an economy: a medium of exchange, a unit of account, a store of value, and a standard of deferred payment. The existence of money simplifies the process of buying and selling by eliminating the need for a double coincidence of wants, which is the situation where two parties each have a good or service that the other wants.