A certain market is characterized by many small firms, easy entry and exit, zero economic profit in the long run, and firms accept the price that is determined in the market. Which market structure does this describe?

Brian can easily determine that the whole sandwich, while twice as long as the half, is priced at less than twice as much.

unit of account

Brian accumulates money in his savings account for future purchases.

Store of value

Brian buys his lunch with a $10 bill.

Medium of exchange

Explanation:

Money's four functions are:

Medium of exchange = you can use money to purchase or sells goods and services. Unit of account = money helps us to understand the relative value of goods and services, since the higher the price, the higher the value of a good or service is. Store of value = you can save money for future useStandard of deferred payment = money allows people to take or hand out loans that will be repaid in the future