Economists use changes in gdp to measure a) the balance of trade with other countries. b) any economic growth or shrinkage. c) the causes of unemployment. d) the distances between cities.

The second alternative is correct (B).

GDP is a form used by economists to measure the final wealth produced by a country in a given period of time, usually one year.

This is a way of comparing the evolution of the country to the time, that is, whether the country has become rich or impoverished. In addition, there is the concept of GDP per capita, which calculates the proportionate wealth of the country for each citizen.

the answer is b any economic growth or shrinkage.

Explanation:

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c. typhoon

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