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The relative quality index is defined as the unit value of a countrys exports expressed as a percentage of the unit value of total world exports, minus 100. Note that the unit value of world exports rose by about 20% over the ten years to 1997, so it is possible for a country's unit value to have risen while its relative quality index as measured here falls (eg France and Spain). Source: Anderson and Berger (1999, Figure 4). |