问题
单项选择题
With respect to discretionary changes in fiscal policy, the time period, between the recognition of the change and the time the policy change is enacted is best described as the（）
A. impact lag.
B. recognition lag.
C. administrative period.
答案
参考答案：C
解析：
The three types of time lags that make the timing of discretionary policy difficult are: Recognition lag: The time period between an actual change in economic conditions and the recognition of the change by policy makers. Administrative lag: The time period between the recognition of the change and the time the policy change is enacted. Impact lag: The time period between implementation of the policy change and the impact of the change.