这题有对应的知识点讲解吗

问题如下：

Which of the following is a limitation on the ability of central banks to stimulate growth in periods of deflation?

选项：

A.Ricardian equivalence. B.The interaction of monetary and fiscal policy. C.The fact that interest rates have a minimum value (0%).

解释：

Deflation poses a challenge to conventional monetary policy because once the central bank has cut nominal interest rates to zero to stimulate the economy, they cannot cut them further.

中文解析：

通货紧缩对传统货币政策构成挑战，因为一旦央行将名义利率降至零以刺激经济，它们就无法进一步降息。