European Monetary System: Paving the Way for the Euro

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The European Monetary System (EMS) was an arrangement of adjustable fixed exchange rates set up in 1979 by members of the European Community (EC) to limit currency swings between their economies and to bring inflation rates closer together. Its core tools were the European Currency Unit (ECU), a basket currency, and the Exchange Rate Mechanism (ERM), which held participating currencies within set bands. The EMS was superseded by the Economic and Monetary Union (EMU), which introduced the euro in 1999.

What was the European Monetary System?

After the Bretton Woods system of pegged exchange rates broke down in the early 1970s, major currencies began to float freely against each other. For countries trading heavily within a customs union, sharp exchange rate moves made prices, farm support schemes and cross-border investment hard to plan. A first attempt to hold European currencies together, the “snake in the tunnel” launched in 1972, lost several members within a few years.

The EMS was a second, more structured attempt. It grew out of an initiative by West German Chancellor Helmut Schmidt and French President Valéry Giscard d’Estaing and was approved by the European Council in 1978. Its stated aims were exchange rate stability, lower and more similar inflation across members, and a framework for closer economic convergence. Over time those aims became stepping stones toward a single currency.

How the EMS worked

The European Currency Unit

The ECU was a composite unit, not a circulating currency. It was defined as a basket containing fixed amounts of member currencies, weighted mainly by each country’s economic size and share of intra-community trade. The basket grew as the community expanded and eventually included 12 currencies. The ECU served as the reference point for central rates, as the denominator for some official transactions and claims between central banks, and as an accounting unit for the EC budget. Private markets also issued bonds and loans in ECU.

The Exchange Rate Mechanism

Each ERM currency had a central rate against the ECU. From those, a grid of bilateral central rates was derived for every pair of currencies. Most currencies could move up to ±2.25% around each bilateral central rate; some members, including Italy at first and later Spain, Portugal and the UK, used a wider ±6% band.

When a pair reached the edge of its band, both central banks involved were obliged to intervene, the strong-currency bank buying the weak currency and the weak-currency bank selling the strong one. Short-term credit facilities between central banks helped fund these operations. A “divergence indicator” was also designed to flag a currency drifting away from the average before it hit a bilateral limit.

Realignments

Central rates were not permanent. If a currency could not be defended, members and the European Commission agreed on a realignment, revaluing stronger currencies, devaluing weaker ones, or both. Realignments were frequent early on but became rarer from the mid-1980s, as members relied more on national interest rates to keep currencies inside their bands.

Worked example: an ERM band

Hypothetical figures for illustration only.

Suppose Currency A has a central rate of 2.00 per ECU and Currency B has a central rate of 6.00 per ECU.

1. Bilateral central rate: 6.00 ÷ 2.00 = 3.00 units of B per unit of A.
2. Upper limit (±2.25% band): 3.00 × 1.0225 = 3.0675 B per A.
3. Lower limit: 3.00 × 0.9775 = 2.9325 B per A.

If A strengthens until one unit costs 3.0675 B, both central banks must act: A’s central bank sells A and B’s central bank buys B, or interest rates are adjusted to change capital flows. If pressure persists, the two governments can request a realignment, for example moving A’s central rate to 2.10 per ECU, which resets the whole grid. Under a ±6% band, the same pair could range from 2.82 to 3.18 before intervention became compulsory.

Why the EMS mattered

Because the German mark was the most stable currency in the system, the Bundesbank’s policy became the de facto anchor. Countries with higher inflation, such as France and Italy, could “import” credibility by tying their currencies to the mark, which pressured them to restrain prices.

It also built the coordination habits that monetary union later relied on:

• 1989: The Delors Report, prepared under Commission President Jacques Delors, set out a three-stage plan for moving from the EMS to full monetary union.
• 1992 to 1993: The Maastricht Treaty was signed in 1992 and took effect in November 1993, creating the European Union and setting convergence criteria for joining the single currency, including ERM participation.
• 1994: The European Monetary Institute was set up to prepare for a common central bank.
• 1998: The European Central Bank replaced it, taking responsibility for a single monetary policy.
• January 1999: The euro was launched for 11 countries at irrevocably fixed conversion rates, with the ECU converted to euros one for one. Euro notes and coins followed in 2002.

The 1992 and 1993 crisis

German reunification in 1990 led the Bundesbank to raise interest rates to contain inflation. Other ERM members, several facing weak growth and rising unemployment, had to keep their own rates high to defend their pegs. Markets judged some of those pegs unsustainable.

In September 1992 the UK, which had joined the ERM only in 1990, left it after heavy selling of sterling; Italy also suspended participation. Spain, Portugal and Ireland devalued. In August 1993, after renewed pressure on the French franc and others, members widened the normal band to ±15%. The system survived in name, but the narrow bands that defined it were gone. The episode also shaped British policy afterward: the UK never adopted the euro, nor did Denmark or Sweden.

Limitations and criticisms

• Asymmetry: In practice the anchor country set monetary conditions for everyone else, so members could inherit interest rates unsuited to their own economy.
• Speculative vulnerability: A fixed band with open capital flows gave traders a one-way bet when a devaluation looked likely.
• Loss of national control: Requiring common agreement for realignments removed a decision that governments had previously made alone, which drew political criticism.
• Adjustment without exchange rates: The same issue resurfaced inside the euro: during the sovereign debt crisis after 2008, Greece, Ireland, Portugal, Spain and Cyprus could not devalue to regain competitiveness.

EMS vs. ERM vs. EMU vs. ERM II

• EMS: the overall 1979 framework, including the ECU, the ERM and credit facilities. A country could belong to the EMS without joining the ERM, as the UK did from 1979 to 1990.
• ERM: the band mechanism within the EMS that actually constrained exchange rates.
• EMU: the Economic and Monetary Union, the later arrangement with a single currency and a single central bank, not merely linked national currencies.
• ERM II: the successor mechanism started in 1999 that links non-euro EU currencies to the euro, with a standard ±15% band, and serves as a waiting room for countries preparing to adopt the euro.

The Bottom Line

Readers studying the euro, European interest rates or currency pegs can trace many current arrangements back to the EMS. Its bands and realignments showed how tying currencies to a stable anchor can lower inflation. The 1992 and 1993 crisis showed how fixed rates with open capital flows can break under market pressure. The same lack of a devaluation option returned inside the euro after 2008.