A. central bank bases its long-run strategy for achieving price stability on targeting the growth rate of the money supply to equal the difference between the 10-year average growth rate of real GDP and the 4-yearaverage growth rate in the velocity of money. The bank also attempts to reduce the magnitude of business cycles. When the bank’s governing board perceives a significant difference between actual real GDP and full-employment real GDP, they adjust the money supply in the countercyclical direction: Which type of monetary policy is the Central bank following（）
A. Fixed-rule.
B. Discretionary.
C. New Keynesian feedback rule.
参考答案：B
解析：
The central bank’s policies include elements of the new Monetarist and new Keynesian feedback rules. However, because policy adjustments rely on the judgment of the bank’s governing board rather than on a specific role, the bank is using discretionary monetary policy.