#1080 1983 · Hong Kong Government (John Bremridge) · Monetary policy

Hong Kong tied its own hands by law, backing every dollar with a US dollar in reserve

问题

Panic selling crashed the Hong Kong dollar nearly 35% in days, and pledges to defend the currency were not believed

背景

By September 1983, uncertainty over Hong Kong's political future as Sino-British talks over the territory's return to China stalled, and confidence in the Hong Kong dollar collapsed. In what became known as Black Saturday, the currency plunged from about 6.5 to as low as 9.6 per US dollar in a matter of days, supermarket shelves emptied as residents rushed to convert cash into goods, and some shops stopped accepting Hong Kong dollar notes altogether. Officials could have issued reassurances that the government would defend the currency, but Hong Kong's monetary authorities retained full discretion to print money, and a government that can always print more of its own currency has no credible way to promise it won't.

Verbal commitments and ad hoc central bank interventions had already failed to stop the slide, because markets understood that discretion meant the defense could be abandoned the moment it became politically inconvenient. What was needed was not a stronger statement of intent but a structure that removed the government's own capacity to devalue.

换别人会怎么做

Hong Kong could have issued public statements defending the currency, had officials intervene directly in trading as needed, or negotiated short-term support from other central banks — all of which leave the government's discretion over the money supply intact and therefore leave the underlying doubt unresolved.

他们看到了什么

Hong Kong saw a promise to defend the currency was cheap talk from an authority that could always print more of it. Requiring US dollar reserves behind every note removed its own ability to inflate away.

那一手

Financial Secretary John Bremridge introduced the Linked Exchange Rate System on 17 October 1983, a currency board arrangement fixing the Hong Kong dollar at 7.8 per US dollar and legally requiring that every Hong Kong dollar issued be backed by an equivalent US dollar in reserve, removing the monetary authority's discretion to expand the money supply without matching reserves.

为什么管用

A discretionary defense of a currency is only as credible as the government's incentive to keep defending it, and markets know that incentive can change. A currency board removes the choice entirely: expanding the money supply becomes mechanically impossible without first acquiring the US dollar reserves to back it, so there is no longer a decision to distrust, only an arithmetic constraint to verify. That verifiability is what let confidence return within days rather than after years of consistent behavior, and it's also what let the peg withstand a genuine stress test in 1997-98, when speculators who bet on other regional currencies breaking found Hong Kong's mechanism harder to attack because there was no discretionary decision left to pressure.

值了多少

The peg stabilized the currency within days and has held near 7.8 HKD per USD for over 40 years, surviving the 1997-98 Asian crisis.

什么时候会失灵

A currency board only works if the reserves genuinely back the currency at all times and if the fixed rate is set at a level the economy can sustain; an overvalued or undervalued peg imposes real costs on interest rates, employment, or asset prices that a floating currency would otherwise absorb. It also removes an economy's ability to use its own monetary policy to respond to shocks that don't affect the anchor currency in the same way, which is a real cost paid every year the peg holds.

后来呢

The Linked Exchange Rate System remains in force today under the Hong Kong Monetary Authority, one of the longest-running currency board arrangements in the world.

资料来源

[1]Hong Kong dollar peg: what is it and why is it important?South China Morning Post, 2020scmp.com