Unequal by Design
The Balassa-Samuelson effect explains why sharing a currency does not mean sharing a standard of living — and why it probably never will.
A German factory worker and a Greek café owner both spend euros. But their euros come from very different productive foundations. In 2023, the average gross monthly wage in Germany was approximately €4,250; in Greece, around €1,450 — both countries inside the same currency union, bound by the same monetary policy, yet separated by a threefold wage gap (approximate figures, European Commission). This is not a flaw in the euro. It is a structural feature of economies at different levels of productivity, first described independently in 1964 by economists Béla Balassa and Paul Samuelson.
Two Tracks
Every economy runs on two tracks. The first is the tradable sector — goods and services that compete internationally: cars, semiconductors, pharmaceuticals, financial services. Prices here are set by global competition and tend to converge across borders. The second is the non-tradable sector — haircuts, restaurant meals, plumbers, taxi rides. These cannot be exported. A Greek barber does not compete with a German barber.
Here is the key mechanism. In a highly productive economy like Germany's, wages in the tradable sector are high — driven by world-class output per worker in manufacturing and industry. Because workers can move freely between jobs within the country, wages in the non-tradable sector get pulled upward too. A Berlin barber charges more than an Athens barber not because he cuts hair faster, but because his alternatives — working in a factory, an office, a lab — pay far more than they do in Greece.
This is the Balassa-Samuelson effect in its purest form: productivity differences in tradables spill over into wages and prices across the entire economy, including sectors where productivity between the two countries is essentially identical.
The Currency Trap
Before the euro, the exchange rate performed a quiet but essential function. If Greece's economy was less productive than Germany's, the drachma would trade at a weaker level than the deutschmark. Greek wages in drachmas might look adequate domestically, but internationally they translated into lower purchasing power — which kept Greek exports competitive and the economy in rough balance.
The euro removed this valve. With a single currency, there is no exchange rate to adjust. A German wage of €4,250 and a Greek wage of €1,450 share the same denomination, with no automatic mechanism to rebalance them. The only adjustment paths that remain are internal devaluation (cutting wages and prices — politically brutal, as the 2010s demonstrated), labor migration (Greek workers relocating to Germany, which happened at significant scale after 2010), or fiscal transfers from richer to poorer members (which the Eurozone's architecture deliberately resists).
This is not a critique of the euro as a project. It is a structural observation: a common currency functions most smoothly when member economies have similar productivity profiles. When they do not, the Balassa-Samuelson effect transforms a monetary union into a permanent source of imbalance.
Hard Data
The productivity differential is not marginal. According to Eurostat, GDP per hour worked in Germany is more than double that of Greece. Wages roughly track that ratio, and the gap is not primarily a story about effort. Greeks consistently work more hours per year than Germans — the OECD data has shown this for decades. The difference is structural: capital stock, industrial complexity, export sophistication, institutional depth.
The Balassa-Samuelson framework predicts precisely this outcome. Where tradable-sector productivity is more than twice as high, economy-wide wages will tend to be higher — not because non-tradable workers are twice as productive, but because the entire productive base supporting their wages is twice as strong.
Structural, Not Circumstantial
Wages in a currency union reflect not just what workers produce, but the productive power of the entire economy around them — and no common currency can equalize that.



