Refer to the above graphs, in which the numbers in parentheses near the AD1, AD2, and AD3 labels indicate the level of investment spending associated with each curve, respectively. All numbers are in billions of dollars. The interest rate and the level of investment spending in the economy are at point C on the investment demand curve. To achieve the long-run goal of a noninflationary full-employment output Qf in the economy, the Fed should: