李嘉图均衡是啥来着。。

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：

C is correct.

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.

考点：Limitation of Monetary Policy

解析：在 deflation 的状态下，利率只能被央行设置到0的水平，却很难被设置到0以下。所以C选项正确。

李嘉图均衡是财政政策的范畴，不会对 deflation 产生影响，所以A选项不入选。

同方向的货币政策和财政政策的联合使用可以强化货币政策效果，而非货币政策的限制。所以B选项不入选。