Details of the Domain Measurement Framework
Each equilateral triangle represents a price simplex, oriented as
shown on the right. The location of a simplex indicates the
benchmark cross-price elasticities of substitution. The
cross-elasticities between goods 1 and 2 are fixed while the other
two cross-price elasticities are varied. The area indicated in the
left diagram indicates all combinations of the cross-price
elasticities which are consistent with benchmark convexity.