The aggregate is

a a type of economic system
b the total number of goods demand or supplied
c a form of revenue
d the total profit made on sales

The correct answer is letter B.

Explanation:  Macroeconomics studies the macroeconomic aggregates that affect a country, such as inflation, interest, and aggregate consumption. Aggregate consumption makes up aggregate demand within macroeconomic theory. It consists of household consumption expenditure in an economy such as food, housing and leisure.

stable food supply,social structure, government,religion,culture/art,technology and writing/language;