Plaza Accord
The 1985 agreement signed at the Plaza Hotel in New York, in which the US, Japan, West Germany, France, and the UK coordinated currency intervention to deliberately depreciate the US dollar against the Japanese yen and German mark, reversing the dollar's overvaluation that had made American manufacturing uncompetitive. For Japan, the resulting yen appreciation triggered asset bubbles and eventual economic stagnation.
By 1985, the US dollar had appreciated roughly 50% since 1980, driven by high US interest rates under Paul Volcker. This made American exports expensive and imports cheap, producing massive US trade deficits (especially with Japan and Germany) and serious damage to US manufacturing. American industries were being priced out of both domestic and export markets by a dollar kept artificially strong by capital flows seeking high US interest rates.
The accord: in September 1985, finance ministers and central bank governors of the G5 (US, Japan, West Germany, France, UK) met at the Plaza Hotel and agreed to coordinate foreign exchange intervention to depreciate the dollar. The yen and mark would be allowed (and actively pushed) to rise. The dollar fell approximately 50% against the yen over the following two years (from ¥250 to ¥120).
The Japanese consequence: the rapid yen appreciation made Japanese exports (cars, electronics) dramatically more expensive in dollar terms, hurting Japanese industry. Japan's government responded with expansionary monetary policy (low interest rates) to stimulate domestic demand, which inflated massive asset bubbles in Japanese stocks and real estate through the late 1980s. When the Bank of Japan raised rates in 1989–90 to deflate the bubble, the resulting crash produced Japan's 'Lost Decade' (and then lost decades) of stagnation from which Japan has never fully recovered.
The game-theory lesson: the Plaza Accord illustrates that the US could use its position as the rule-setter in the dollar-based system to unilaterally restructure other nations' economies, compelling Japan to revalue its currency on American terms, triggering consequences that devastated Japan without US consent being required. The Game Theory series uses this as evidence that even apparently wealthy, powerful US allies are ultimately playing within an American-controlled game whose rules can be changed at American discretion.
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Frequently asked questions
What was the Plaza Accord? ＋
A 1985 agreement at New York's Plaza Hotel where the US, Japan, West Germany, France, and UK coordinated to deliberately depreciate the dollar against the yen and mark, reversing the dollar's overvaluation that had made US manufacturing uncompetitive. The yen roughly doubled in value against the dollar over two years, from ¥250 to ¥120.
How did the Plaza Accord cause Japan's economic stagnation? ＋
Rapid yen appreciation made Japanese exports (cars, electronics) expensive in dollar terms, hurting industry. Japan responded with very low interest rates to stimulate domestic demand, inflating massive stock and real estate bubbles. When the Bank of Japan raised rates in 1989–90 to cool the bubble, the crash triggered Japan's 'Lost Decade', deflation, stagnant growth, and zombie banks that Japan has never fully escaped. An American policy adjustment to fix US trade deficits restructured Japan's economy with consequences Tokyo had no say in.