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The Amoroso–Robinson relation, named after economists Luigi Amoroso and Joan Robinson, describes the relation between price, marginal revenue, and elasticity of demand.
Perhaps his most notable contribution has been to show that if long-run balance of payments equilibrium is a requirement for a country, its growth of national income can be approximated by the ratio of the growth of exports to the income elasticity of demand for imports (Thirlwall's Law).