This chapter introduces the Aggregate Demand/Aggregate Supply model of macroeconomics. Read the introduction and Section 1 to learn about Aggregate Demand and the three effects (weath, interest rate, and international trade) that cause the downward slope. Recall the difference between quantity demanded and demand - the same logic applies to Aggregate Demand. Identify the variables that change (shift) the Aggregate Demand curve. Read this chapter and attempt the "Try It" exercises. You will revisit certain sections of the chapter later in this unit.
All components of aggregate demand (consumption, investment, government purchases, and net exports) declined between 1929 and 1933. Thus the aggregate demand curve shifted markedly to the left, moving from AD1929 to AD1933.
The reduction in nominal wages corresponds to an increase in short-run aggregate supply from SRAS1929 to SRAS1933. Since real GDP in 1933 was less than real GDP in 1929, we know that the movement
in the aggregate demand curve was greater than that of the short-run aggregate supply curve.