China doesn't let its currency float freely. Understanding how the People's Bank of China manages the yuan reveals one of the most consequential and controversial policies in global economics.
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China manages its currency — the renminbi (RMB), also called the yuan — more actively and deliberately than any other major economy. Unlike the U.S. dollar, euro, or Japanese yen, which float freely against each other with central bank intervention only at the margins, the RMB operates within a managed float system where the People's Bank of China (PBOC) sets a daily central parity rate and allows the currency to trade within a defined band (currently ±2%) around that rate.
This management is not incidental — it is a core element of China's economic development strategy, its export competitiveness policy, and its long-term goal of RMB internationalization. Understanding how China manages its currency explains much about global trade imbalances, U.S.-China economic tensions, and the mechanics of currency manipulation accusations.
The PBOC sets the daily "fixing" — the central parity rate — each morning based on a basket of currencies and the previous day's closing rate, with significant discretion to smooth or direct movements. State-owned banks, which dominate Chinese financial markets, implement the policy by buying or selling RMB in the onshore market to keep the rate within the permitted band.
When the PBOC wants to prevent the RMB from appreciating (as happens when China runs large trade surpluses and capital inflows create dollar supply), it buys dollars and sells RMB — accumulating foreign exchange reserves and keeping the currency weaker than market forces alone would produce. China's foreign exchange reserves peaked at approximately $4 trillion in 2014, reflecting years of intervention to prevent appreciation. When the PBOC wants to prevent depreciation (as occurred in 2015-2016 during capital outflow pressure), it sells dollars and buys RMB, drawing down reserves.
The U.S. Treasury periodically accuses trading partners of "currency manipulation" — deliberately undervaluing their currencies to gain export advantages. China has been the primary target of these accusations, particularly during periods of large bilateral trade deficits. The 2019 Trump administration formally labeled China a currency manipulator, a designation with limited practical consequences but significant symbolic weight.
The economic substance behind the accusation: a deliberately undervalued RMB makes Chinese exports cheaper in dollar terms and makes American exports more expensive in RMB terms, contributing to the bilateral trade imbalance. The counterargument: China's intervention has at various times been in both directions (supporting and suppressing the RMB), and the current account surplus that partly reflects RMB undervaluation also reflects structural factors (high Chinese savings rates, industrial policy, supply chain dominance) that exchange rate adjustment alone cannot address.
China has a long-term strategic goal of internationalizing the RMB — increasing its use in international trade, finance, and reserves — to reduce Chinese dependence on the dollar system and enhance China's geopolitical leverage. Progress has been slow relative to initial ambitions: the RMB accounts for approximately 2-3% of global payments (versus 40%+ for the dollar) and about 2.5% of global central bank reserves.
The fundamental obstacle is the conflict between RMB internationalization and domestic financial control. A truly internationalized currency requires open capital accounts, transparent financial markets, and rule of law for foreign investors — conditions incompatible with the capital controls and state-directed financial system that China maintains for domestic stability and Communist Party control. Until China resolves this tension, RMB internationalization will progress at the margin rather than fundamentally challenging dollar dominance. See BRICS challenging dollar dominance, the petrodollar system, and What Makes a Currency.