Joseph took a class in macroeconomics, which means that he was studying the behavior of

Joseph took a class in​ macroeconomics, which means that he was studying the behavior of​ the overall economy.

Macroeconomics is a branch of economics. It deals with  indicators such as GDP, unemployment rates, national income and price indices.

Microeconmics on the other hand studies individuals and business decisions.

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the correct answer is :

{b.}   ( american workers lose job opportunities )

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    -sprinkles