What concept summarizes all individual consumer choices during varying prices?

The correct answer is aggregate demand. This concept represents the total quantity of all goods and services demanded across all consumers in an economy at different price levels. It captures the overall consumer choices and behaviors in response to varying prices, reflecting the relationship between the overall price level in the economy and the quantity of goods and services that consumers are willing to purchase.

Market equilibrium refers to the point where the quantity of goods supplied equals the quantity of goods demanded, but it does not summarize individual consumer choices at varying prices. Overall market demand might seem similar, but it is less commonly used as a term compared to aggregate demand when discussing macroeconomic principles. Consumer surplus is the difference between what consumers are willing to pay for a good or service and what they actually pay. While it is related to consumer choices, it does not summarize those choices across varying prices like aggregate demand does.