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Explain the term Macroeconomics

Macroeconomics is a study of: (1) the economy as an entire or in the aggregate. (2) worldwide economic problems of individual households. (3) interactions among firms and households in one exact market or industry. (4) the rising income inequality within the developed world.

I need a good answer on the topic of Economic problems. Please give me your suggestion for the same by using above options.

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