How buying foreign currency creates yuan
When the People’s Bank of China buys dollars or other foreign currencies, it pays for them in yuan. That payment adds yuan to the banking system: the banks selling the foreign currency receive more funds, which can support lending and spending. In currency markets, the purchase also adds demand for foreign currency and supply of yuan, helping restrain the yuan’s value.
But the central bank may not want all that new liquidity—the ready-to-use funds available to banks—to circulate freely. A surge of lending could complicate efforts to manage credit, prices, or financial risks.
The brake: absorb the extra liquidity
To offset the injection, the central bank can use sterilization: operations that withdraw or tie up yuan liquidity created by foreign-exchange purchases. It might sell central-bank bills or other securities, taking yuan from buyers in exchange. It can also require banks to keep a larger share of their deposits in reserve rather than use those funds for lending.
These measures do not erase the foreign currency the central bank bought. They change what happens to the yuan paid for it: instead of freely supporting additional loans and purchases, some of that money is absorbed or made less available to banks.
A policy balancing act
The two goals pull in different directions. Buying foreign currency can lean against appreciation of the yuan, while withdrawing domestic liquidity limits the effect of that intervention on credit and spending. The central bank must calibrate the brake: too little can leave more money circulating than policymakers want; too much can tighten financing for banks and borrowers.
So “printing money” here does not mean simply sending fresh cash into the economy. The key is the second move: the central bank can create yuan to influence the exchange rate, then use other tools to keep that yuan from translating one-for-one into more domestic lending.
