we learned that aggregate demand is the total demand for goods and services in an economy. But the aggregate demand curve alone does not tell us the equilibrium price level or the equilibrium level of output. In order to obtain this information, we need to add the aggregate supply curve to the diagram containing the aggregate demand curve. Then, and only then, do the equilibrium values of the economy in the AS-AD model appear. The aggregate supply curve shows the relationship between the price level and the quantity of goods and services supplied in an economy. The equation for the upward sloping aggregate supply curve, in the short run, is Y = Ynatural + a(P - Pexpected). In this equation, Y is output, Ynatural is the natural rate of output that exists when all productive factors are used at their normal rates, a
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