Testing Hicksian Separability Over Space
If relative prices of goods within a commodity group are constant, Hicksian separability lets the price of a single good represent the group price level. This is relied on by designers of price questionnaires used in household surveys and by methods of estimating demand systems from household survey data. A survey from Vietnam with multiple specifications from within the same food groups clearly shows that within-group relative prices are not constant over space.
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