In macroeconomics, a describes the common way in which market values are measured in an economy (money acts as a common denominator, an accounting method that simplifies thinking about trade-offs).
a. store of exchange
b. medium of exchange
c. unit of account
d. store of value

In macro economics a unit of account describes the common way i which the market values are measured in an economy

Explanation:

When the market capitalization of a company which is traded in public and the company's number of out standing shares are multiplied then it is the way to calculate the market value in an economy

The economic value and the market values are not the same the market value is the value of a product in the market and the amount that the consumer is willing to pay for that product on the other hand economic value is the value that is benefited from the products that is the gain value in the market

answer; rapid growth in buyer demand and high buyer switching cost;