Abstract
One country's exports of a particular commodity are usually imperfect substitutes for similar exports from other countries. Consequently, the price elasticity of export demand involves unknown cross elasticities between sub‐groups of the commodity. However, there are constraints on the relative magnitudes of all the sub‐group elasticities. These make it possible to assess the degree to which the whole commodity elasticity divided by the market share is an over‐estimate of the export elasticity.
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