Foreign Exchange Interventions, Capital Controls and Monetary Policy: The Case of China

China has maintained a closed capital account to the private sector and channeled capital flows through the public sector by foreign exchange interventions. This paper presents an open economy model that incorporates this capital account policy configuration in order to study whether foreign exchange interventions can improve welfare in the presence of capital controls, compared to an open capital account. Furthermore, I analyze how these interventions affect the conduct of monetary policy. I find that optimal interventions improve welfare by strategically managing the terms of trade. In the presence of domestic nominal rigidity, interventions increase welfare even if monetary policy is set optimally. I find monetary policy effectively eliminates domestic price distortions, while foreign exchange interventions efficiently correct terms-of-trade externalities.