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MENTAL MODEL · M5768

Gerschenkron Effect

Gerschenkron Effect
BusinessHigh supportDevelopment Economics
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Updated 2026-08-05

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INTRODUCTION

English translation pending.

CORE DEFINITION

Named after the economic historian Alexander Gerschenkron, who identified it while estimating Soviet industrial output in the 1940s and 1950s, the effect describes a systematic bias in international and intertemporal comparisons. Because relative prices and industrial structures differ between countries, valuing each country's output at a single base year's prices produces weights that misrepresent one of them, so measured gaps depend on which base year is chosen. The key constraint is that the bias grows with the distance between the base year and the year being compared.

SCAFFOLDING EFFECT

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- Check the base: Before trusting a cross-country comparison, ask which year's prices were used. - Test sensitivity: Recompute the index with another base year and see whether the ranking survives. - Read gaps carefully: Treat large measured gaps between economies as partly an artefact of price weights.

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The bias arises because a base year's price structure reflects the output mix of the economy that dominates the comparison. Valuing a backward economy's output at those prices gives heavy weight to its low-productivity sectors and light weight to its advanced ones, while the reverse holds for the leading economy. The same physical output therefore converts into different index values depending on the base year, and the divergence widens as the base year moves further away.

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Gerschenkron_effectZH · Explicit
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