Assume that the MPC is 0.8 and the reserve requirement is 0.1. If the Federal Reserve needs to increase aggregate demand by $100 billion at each price level to move the economy back to full employment and the current interest rate is 7%, then the Federal Reserve should the money supply by . a. buy, $4 billion.
b. sell, $4 billion.
c. buy, $2 billion.
d. sell, $2 billion.

The manager of the quick stop corner convenience store (which never closes) sells four cases of stein beer each day. order costs are $8.00 per order, and stein beer costs $.80 per six-pack (each case of stein beer contains four six-packs). orders arrive three days from the time they are placed. daily holding costs are equal to 5 percent of the cost of the beer. if he were to order 16 cases of stein beer at a time, what would be the average inventory level? a. 0.25 days b. 3 days c. 1 day d. 4 days e. 20 days