Use the following graphs to answer the next question. In the graphs, the numbers in parentheses near the AD1, AD2, and AD3 labels indicate the levels of investment spending associated with each curve. All figures are in billions. A shift in the aggregate demand curve from AD3 to AD2 can be achieved by Federal Reserve action to Multiple Choice increase the reserve requirement. increase the discount rate. sell government securities in the open market. buy government securities in the open market