When economists study aggregate supply and aggregate demand, what are they studying?

The studying of aggregate demand and aggregate supply they are studying for macroeconomics.

Macroeconomics is termed as branch of economics which deals with structure, performance, and decision-making of economy.

Macroeconomist develops models which explains the relationship which is between factors for example, output, national income consumption, investment, saving, international finance and international trade.

Answer: They are studying Macroeconomics.

Explanation: Macroeconomics is a branch of economy that deals with the study of demand and supply and overall economic activities happening around as a whole instead in parts. Thus, when economists are studying aggregate demand and supply, they are studying macroeconomics and not microeconomics.