Hong Kong Taps Reserves to Defend Dollar Peg Amid Greenback Surge

On Wednesday in New York trading hours, Hong Kong's de facto central bank made a move it hadn't needed to make in three years: it reached into its foreign-exchange reserves and sold U.S. dollars to buy Hong Kong dollars. The Hong Kong Monetary Authority purchased 1.586 billion Hong Kong dollars—roughly $202 million—to prevent the local currency from weakening past the lower boundary of its permitted trading band.

The action was a straightforward defense of a system that has anchored Hong Kong's financial identity since 1983. The Hong Kong dollar is pegged to the U.S. dollar within a narrow range: HK$7.75 to HK$7.85 per greenback. When the local currency drifts toward that weak end, the monetary authority is obligated to sell dollars and buy Hong Kong dollars, draining liquidity from the system and pushing up borrowing costs. When it strengthens too much, the authority does the reverse. For nearly four decades, this Linked Exchange Rate System, or LERS, has been the mechanical heart of Hong Kong's role as a global financial hub.

But the conditions forcing this intervention reveal the pressures now bearing down on the arrangement. The U.S. dollar has surged this year as the Federal Reserve began raising interest rates and as the war in Ukraine sent investors fleeing toward safer assets. The Wall Street Journal's Dollar Index hit 96.51 on Wednesday, its highest closing value since March 2020. At the same time, capital has been draining from Hong Kong itself. Investors have reduced their holdings of Hong Kong assets, driven out by a pandemic-induced slowdown in both Hong Kong and mainland China, by a sweeping crackdown on Chinese technology companies, and by the simple mathematics of yield: U.S. interest rates have climbed faster than Hong Kong's, making dollar-denominated investments more attractive.

Kevin Lai, chief economist for Asia excluding Japan at Daiwa Capital Markets, laid out the mechanics plainly. The Federal Reserve's actions and inflation concerns are pushing up both short- and long-term yields in the United States. That gap is enough to pull money out of Hong Kong. When the monetary authority buys Hong Kong dollars to defend the peg, it tightens the money supply, which should eventually push local interest rates higher and make the Hong Kong dollar more appealing. But the process takes time, and in the meantime, the system absorbs stress.

The last time the monetary authority had to intervene was March 2019, when excess cash in the local financial system was pushing down short-term interest rates. In October 2020, it sold Hong Kong dollars again as the currency surged toward the lower band—a mirror image of the current situation. The peg has weathered many cycles over its nearly four decades, the monetary authority noted in a statement, and it remains committed to maintaining monetary and financial stability.

Yet the durability of the system has become a question in recent years. As Beijing's control over Hong Kong has tightened, as U.S.-China tensions have risen, and as China has worked to promote the yuan as an international currency, some investors and analysts have wondered whether the peg could survive. The geopolitical backdrop is different now than it was in 1983, when the peg was established. But market participants and analysts say the arrangement is robust. Paul Mackel, global head of foreign-exchange research at HSBC, offered a weathered assessment: the system has been tested before, and the peg is unlikely to break anytime soon. Still, if the Federal Reserve sustains its rate increases, the pressure on Hong Kong's currency and reserves could intensify, testing whether the nearly four-decade-old mechanism can hold.