Economists use changes in GDP to measure ___ the balance of trade with other countries.
any economic growth or shrinkage.
the causes of unemployment.
the distances between cities.

The people who study, analyses, practices theories of economics and formulate economic policies are called economists. Gross domestic product (GDP) is the main issue that concerns economists.

The correct option is:

Option B. any economic growth or shrinkage.

This can be explained as:

Therefore, economic shrinkage and growth are measured as a change in GDP.

To learn more about GDP follow the link:

link

answer: i'd say the answer is d because the information system is the human already doing the activity.

answer; intensive use of a sales force and is relatively costly;