Impacts of monetary instruments on overnight spread under the interest rate corridor framework: evidence from China

To verify the effectiveness of the monetary policy, the impacts of monetary instruments on overnight spread under the interest rate corridor (IRC) are examined. The People's Bank of China (PBC) has operated the IRC since 2014. To understand the impacts of monetary instruments on overnight spread before and after the IRC framework, the complete samples are divided into two periods.

To model the overnight spread, an exponential GARCH (EGARCH) approach is used which can examine the interbank market interest rates for monetary policy purposes. The overnight money market plays an important role in the implementation of monetary policy.

Chinese interest rate liberalization and the implementation of IRC affect the overnight spread in the short-term financing market. Before the implementation of the IRC, the key factor to affect the overnight spread is mainly affected by the PBC's monetary policy control on the liquidity supply side. After the implementation of IRC, the overnight spread can be the largest part explained by the liquidity demand side and the PBC's multiple monetary instruments have significant impacts on the reduction of overnight spread.

The overnight spread has recently been influenced by various factors that are directly or closely related to the monetary policy instruments and the interest rate policy of the PBC. Chinese interest rate liberalization and the implementation of interest rate corridor policy affect the overnight spread in the short-term financing market.