NO.PZ2021052601000016
问题如下：
Which of the following indicators is most appropriate in predicting a turning point in the economy?
选项：
A.The Industrial Production Index
B.The average bank prime lending rate
C.Average weekly hours, manufacturing
解释：
C is correct. Leading economic indicators have turning points that usually precede those of the overall economy. Average weekly hours, manufacturing is a leading economic indicator. The Industrial Production Index is a coincident economic indicator, and the average bank prime lending rate is a lagging economic indicator.
领先经济指标的拐点通常先于整体经济的拐点。平均每周工时，制造业是一个领先的经济指标。产业生产指数是一个同步的经济指标，而银行优惠贷款平均利率是一个滞后的经济指标。
请问b答案为什么是实时指标？如何理解？
