Louvre Accord: Exchange Rate Stabilization After the Plaza

The Louvre Accord was the G7’s 1987 attempt to lock exchange rates into bands after the Plaza Accord’s cheaper dollar had gone too far. Central banks pledged to buy and sell currency to keep rates in line. It worked, barely, for six months. Then traders overwhelmed it, and the accord quietly dissolved into memory.

The Problem the Accord Tried to Solve

The Plaza Accord of 1985 had done its job. The US dollar, overvalued throughout the early 1980s, fell from 260 yen per dollar to under 200. The deutsche mark climbed. The goal—reducing the US current-account deficit through cheaper exports—was working, but momentum had shifted to overdrive.

By early 1987, traders were no longer correcting an imbalance; they were betting the dollar would collapse forever. Japan and Germany, suddenly facing more expensive imports and competitive pressures, grew alarmed at further weakness. The Bank of Japan and the Bundesbank, the German central bank, signaled they would no longer support further dollar depreciation. They wanted the dollar to stabilize, not fall further. The US, facing an adverse reaction from Congress to continued weakness, agreed. Six major economies—the US, Japan, Germany, France, the UK, and Canada, plus Italy (the G7)—convened at the Louvre in Paris on February 22, 1987.

What the Accord Committed

The Louvre Accord differed sharply from the Plaza in that it was explicit about target ranges. The G7 agreed that the dollar stood at an “appropriate level” and committed to foreign exchange intervention—buying and selling currencies to keep rates within agreed bands. The ranges were narrow: roughly 5–10% around the target. Once a currency hit the band’s edge, central banks would step in.

For example, if the target for dollar-yen was 153–155, and the rate drifted toward 150 (yen strengthening), the Bank of Japan and the Federal Reserve would jointly buy dollars to push it back up. If it neared 160, they’d sell dollars.

The accord also required central banks to coordinate. No unilateral moves. No central bank would suddenly intervene without signaling the others. This was the true innovation: binding coordination among the world’s largest central banks on exchange rates. It read like a commitment to managed exchange rates, something closer to Bretton Woods than to free-floating currencies.

The Louvre Accord also kept the reference ranges secret. Market participants would infer the bands from central bank behavior, but there was no formal publication. The logic was that secrecy would prevent speculation against the edges of the bands.

Early Success and Building Pressure

For the first few months, it held. The dollar stabilized. Yen and mark traders, seeing that central banks meant business, stopped pushing in one direction. The coordinated interventions were modest in size because markets respected the commitment. Central banks didn’t need massive firefights; the threat of coordinated action was enough.

But pressure accumulated. The US fiscal deficit was still large. Capital markets in Japan were booming, creating inflation pressure. The Bundesbank, committed to fighting German inflation, raised interest rates. These divergent fundamentals worked against dollar stability. If the Fed kept rates lower than the Bundesbank for growth reasons, capital would tend to flow toward Germany, pushing the mark up and the dollar down—exactly what the accord forbade.

By summer 1987, the tension was obvious. Traders began testing the commitment. Large-scale operations by central banks became frequent, and costly. The Bank of Japan, in particular, was accumulating dollars at an unsustainable pace, expanding its money supply and risking inflation at home. The Bundesbank was equally frustrated: it didn’t want to buy dollars; it wanted to get richer, not accumulate foreign currency that might depreciate.

The Turning Point: October 1987

The stock market crash of October 19, 1987 (“Black Monday”) broke the accord’s back. Equity prices fell 20% in a day. Investors fled risk globally, including currency risk. The dollar, which should have weakened on the shock, strengthened as panicked capital sought the safety of US Treasury bonds. This perverse move—stronger dollar during US stock collapse—violated the assumed fundamentals of the accord’s stability.

Central banks intervened on a vast scale to prevent dollar appreciation. But the new dynamic—safe-haven buying of dollars—was at odds with the accord’s goal of keeping the dollar from rising. The accord had imagined inflation or interest-rate divergence pushing the dollar; it hadn’t imagined a shock that made dollars attractive for their stability.

By November, the accord was effectively in tatters. The G7 issued a statement saying they’d allow the dollar to appreciate modestly—a tacit admission that the band was breached and would stay breached. The reference ranges, never formally published, were informally discarded.

Why the Accord Failed

The Louvre Accord collapsed for three reasons, each rooted in the difficulty of locking exchange rates without addressing fundamental economics.

Fiscal and monetary policy divergence was too large. The US ran a massive budget deficit. Japan and Germany ran surpluses. These imbalances created pressure for capital flows that no intervention could overcome forever. Intervention works tactically, but it cannot long resist structural flows.

Central banks had different inflation priorities. The Bundesbank was determined to prevent inflation. The Bank of Japan was managing a credit boom. The Fed wanted growth. These priorities created conflicting interest-rate settings, which moved capital and currencies. Coordination on exchange rates required coordination on monetary policy itself—a step too far politically.

The market was too large. Daily forex turnover exceeded $200 billion in 1987. A coordinated central bank operation might command $5–10 billion. This ratio—1:20 or worse—meant that any persistent fundamental could eventually exhaust central bank will and reserves. The market could wait out the defense.

The accord attempted to fix prices without fixing the cause. It was a symptom-treatment, not a cure. Had the G7 tackled the US fiscal deficit simultaneously, or agreed to interest-rate coordination, the accord might have lasted. Intervention alone cannot sustain an exchange rate against its economic fundamentals indefinitely.

The Legacy

The Louvre Accord is remembered as evidence that explicit exchange-rate bands are unsustainable in a world of free capital mobility. Every attempt to lock currencies to specific levels—from Bretton Woods to the European Exchange Rate Mechanism (which nearly broke in 1992)—has foundered on the same reef: fundamentals, eventually, win.

Modern central banks still intervene, but they no longer pretend to maintain an exact level. They intervene to manage volatility, to counter disorderly moves, or to reinforce a policy signal. They coordinate, but they don’t commit to specific bands. The Louvre Accord taught them that lesson, at considerable cost.

See also