NO.PZ2021052601000011
问题如下：
When the spread between 10-year US Treasury yields and the federal funds rate narrows and at the same time the prime rate stays unchanged, this mix of indicators most likely forecasts future economic:
选项：
A. growth.
B. decline.
C. stability.
解释：
B is correct. The narrowing spread of this leading indicator foretells a drop in short-term rates and a fall in economic activity. The prime rate is a lagging indicator and typically moves after the economy turns.
该领先指标差距的缩小预示着短期利率的下降和经济活动的下降。优惠利率是一个滞后指标，通常在经济好转后才会变动。
请问详细过程是怎样的？
