BEIJING — China’s central bank made a net cash withdrawal via open market operations for the sixth consecutive trading day on Aug 28.

The People’s Bank of China conducted 100 billion yuan (about $15.2 billion) of reverse repos, a process by which the central bank purchases securities from commercial banks through bidding with an agreement to sell them back in the future.

The injection was offset by 200 billion yuan in maturing reverse repos, leading to a net withdrawal of 100 billion yuan from the market. This came after a net withdrawal of 330 billion yuan last week.

The operations on Aug 28 included seven-day reverse repos priced to yield 2.45 percent and 14-day contracts with a yield of 2.6 percent, both unchanged from previous operations, according to a central bank statement.

In Aug 28’s interbank market, the overnight Shanghai Interbank Offered Rate (Shibor), which measures the cost at which Chinese banks lend to one another, dropped 0.4 basis points to 2.8510 percent. The Shibor for one-month loans rose slightly to 3.8915 percent.

The central bank has increasingly relied on open market operations for liquidity management, rather than cuts in the benchmark interest rates or reserve requirement ratios.

China set the tone of its monetary policy in 2017 as prudent and neutral, keeping an appropriate liquidity level but avoiding excessive liquidity injections.