Identify what will happen to each of the Fed's tools, the required reserve ratio (increase, decrease), the discount rate (increase, decrease) and U.S. Treasury bills (buy, sell), given the following scenarios. a. Significant decreases in real GDP for three straight quarters ∣ b. Increases in the unemployment rate over the past six months c. Monthly increases in the producer price index for the past four months d. A severe depression e. Significant increases in the CPI over the past six months