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exports of 21 commodities for each country in 1975 and assign a weight to each commodity by dividing the value of the commodity’s exports in 1975 by this total value. The weights are then held constant for the rest of the exercise and are applied to the world prices of the same commodities. Collier and Goderis (2007) construct a commodity export price index composed of agricultural and nonagricultural commodities at a yearly frequency with fixed commodity export weights; to allow the effect of commodity export price to be greater for countries with higher exports