The Plaza Accord: The Day Governments Crashed the Dollar

On 22 September 1985, the finance ministers and central bank governors of five of the world's largest economies gathered at the Plaza Hotel in New York City and agreed, openly and deliberately, to crash the US dollar. It was the only time in modern history that the governments of major market economies have openly coordinated to devalue the world's reserve currency. The Plaza Accord triggered a roughly 40% fall in the dollar over two years and doubled the value of the Japanese yen, reshaping global trade, triggering Japan's asset bubble, and demonstrating in stark terms that currency strength is ultimately a political as much as a market phenomenon.

What was the Plaza Accord and why did it happen?

The Plaza Accord was a joint agreement by the finance ministers and central bank governors of the United States, Japan, West Germany, France, and the United Kingdom — the Group of Five (G5) — signed on 22 September 1985 at the Plaza Hotel in New York. The core commitment was straightforward: the five governments would coordinate their intervention in foreign exchange markets to depreciate the dollar.

The dollar's rise in the early 1980s was not a mystery. US Treasury Secretary James Baker, who led the American delegation, had inherited the aftermath of Paul Volcker's tight monetary policy. High US interest rates had attracted vast capital inflows, driving the dollar up by about 50% between 1980 and 1985 against the currencies of America's major trading partners. The result: American goods became dramatically more expensive abroad, exports slumped, and the US trade deficit ballooned. By 1985, Congress was drafting protectionist legislation, and the Reagan administration faced a choice: negotiate a multilateral currency agreement or watch trade barriers rise unilaterally.

The five signatories and what each wanted

Understanding who was at the Plaza table — and why — explains how a normally fractious group of governments reached agreement.

The accord also required the central bank governors of each nation, making it simultaneously a fiscal and monetary commitment.

How much did the dollar fall?

The dollar's fall after the Plaza Accord was driven not just by actual G5 intervention but by market anticipation of future intervention. Once traders understood that the five largest economies were committed to dollar depreciation, the path of least resistance was to get short dollars. The announcement itself moved markets more than the subsequent buying of yen and Deutsche Marks. This is a recurring lesson: stated policy intent, when credible, drives markets toward the target before governments spend a dollar of reserves.

The Louvre Accord: when the dollar fell too far

By early 1987, the Plaza Accord had "worked" — perhaps too well. The dollar's fall of more than 25% was now generating its own problems: fears of imported US inflation, concern that the yen's strength was crippling Japan, and nervousness in bond markets. The same G5 nations (now joined by Canada to make the G6) met at the Louvre Palace in Paris on 22 February 1987 and agreed to stabilise the dollar near current levels.

The Louvre Accord was less dramatic than Plaza — it acknowledged prevailing exchange rates were "broadly consistent with underlying economic fundamentals" and committed governments to intervene to defend those ranges. It achieved a period of relative stability but did not prevent the dollar from moving further in subsequent months.

The unintended consequence: Japan's bubble

The most dramatic unintended consequence of the Plaza Accord was Japan's subsequent asset bubble. The yen's rapid appreciation squeezed Japanese exporters — companies like Toyota and Sony were suddenly far more expensive in dollar terms. To offset the economic drag, the Bank of Japan cut interest rates and loosened monetary policy substantially. That cheap money flowed into real estate and equities, inflating a bubble that peaked in 1989 and whose deflation consumed Japan's economy for the following decade.

The 1990 crash of the Nikkei — and the subsequent carry trade dynamics that made cheap yen the global funding currency for decades — traces directly back to the monetary response to Plaza. The 2024 yen carry trade unwind is the distant echo of conditions set in motion in 1985.

What the Plaza Accord means for macro currency analysis

Three macro lessons from Plaza that remain directly relevant to using a currency strength meter today:

1. Policy intent changes the fundamental picture Exchange rates are not purely market prices — they are partly policy outcomes. A credible official commitment to move a currency in a direction will attract market flows that do most of the work, often before a single dollar of reserves is spent. The "rates" and "growth" drivers in a fundamental strength model need to incorporate the policy signal, not just the data.
2. Reserve-currency devaluations have global spillovers Depreciating the dollar exported deflation to Japan (via yen appreciation), which Japan's monetary authorities tried to counteract by reflating — creating the bubble. Every major currency move has second-order effects through the global trade and capital network.
3. Sustained misalignment requires sustained intervention The dollar took five years to become 50% overvalued. The correction, once it started, was rapid — but stopping it required a second accord (Louvre). Currencies that move far from fundamental fair value do eventually revert; the timing is the hard part.

For the academic research behind purchasing-power parity and exchange-rate misalignment, the NBER Working Paper "The Plaza Accord, 30 Years Later" by Jeffrey Frankel is essential reading. The BIS Effective Exchange Rate indices provide the primary data series for tracking whether the dollar (or any currency) is above or below its trade-weighted long-run average.

For context on what happens when a currency's peg breaks under market pressure rather than cooperative policy, see Black Wednesday 1992. For a more recent example of peg removal, see the Swiss Franc Shock 2015.

The USD currency page on Pip Theory shows how the dollar's macro fundamentals are scored today across the same five-driver framework; and the about page explains how the methodology connects to the academic literature behind exchange-rate determination.

Educational macro context only — not investment advice.