Along the Curve

Before examining the details of the real-balanced effect, consider the specifics of what it does. A typical aggregate demand curve is presented in the exhibit to the right. The negative slope of the aggregate demand curve captures the inverse relation between the price level and aggregate expenditures on real production.

When the price level changes, the real-balanced effect is activated, which is what then results in a change in aggregate expenditures and the movement long the aggregate demand curve. To illustrate this process, click the [Change Price Level] button.

The real-balanced effect is based on the realistic presumption that the supply of money in circulation is constant at any given time. Money is what the four basic macroeconomic sectors use to purchase production. How much production they are able to purchase (that is, aggregate expenditures) depends on the amount of money in circulation relative to the prices of the goods and services produced (that is, the price level). When the price level changes, the purchasing power of the available money supply also changes and so too do aggregate expenditures. A higher price level means money can buy less production. A lower price level means money can buy more production.

Suppose, for example, that Duncan Thurly's share of the nation's money supply is $10. At a price of $2 each, he can afford to purchase five Wacky Willy Stuffed Amigos (those cute and cuddly armadillos and scorpions). However, if the price level rises, and with it the price of Stuffed Amigos, then he can no longer afford to purchase five of these cuddly creatures. At $2.50 each, he can now afford to buy only four Stuffed Amigos. His share of aggregate expenditures on REAL production declines from five Stuffed Amigos to four. The purchasing power of his $10 of money has fallen and with it his aggregate expenditures on real production. He has succumbed to the real-balance effect.