In the context of aggregate demand and supply, what does 'equilibrium' mean?

• A. It occurs at maximum price levels
• B. It is when demand exceeds supply
• C. It is when quantity of aggregate demand equals quantity of aggregate supply
• D. It is when supply remains constant while demand fluctuates

Answer: (C)

Equilibrium in the context of aggregate demand and supply refers to the point at which the quantity of aggregate demand equals the quantity of aggregate supply. This balance indicates that the total amount of goods and services that consumers, businesses, and the government want to purchase at a given price level matches the total amount that producers are willing and able to sell. At this equilibrium point, there is neither a surplus nor a shortage of goods in the economy, which means that market forces are stable, and there is no inherent pressure for prices to change.

The concept of equilibrium is fundamental in understanding how economies function, as it illustrates how various factors interact to establish stable prices and output levels. Changes in either aggregate demand or aggregate supply can shift this equilibrium, leading to changes in price levels and quantities sold, but the definition itself revolves around the balance between these two forces.