The primary difference between the aggregate demand curve and an individual demand curve is that: a. The aggregate demand curve represents total planned expenditures on all goods and services while an individual demand curve represents a single good or service.

Individual demand curves, also referred to as the Marshallian demand curve, represent the relationship between the price of a single good or service and the quantity demanded by consumers. Consumers are households, firms and the government. The aggregate demand curve depicts the relationship between the price level in the economy and the output demanded by consumers. It is a summation of the demand curves for all goods and services in the economy.