Before revision:  The systematic deviation of individual currencies from this putative universal form (the "inverse square law" ) can be partly ascribed to the differences in their economic prosperity and diversity of export products.
After revision:  The systematic deviation of individual currencies from this putative universal form associated with the median value (~2) of the exponents. We relate the degree of deviation of a particular currency from such an "inverse square law" ) can be partly ascribed to the differences in their economic prosperity and diversity of export products.