Total: 1.000

a Total OECD commodity value is $156,660,455,522 (1989-1991 international dollars, 1998 production).

b Only crops for which international price data are available are considered. Hence, some relatively minor crops, such as paprika, are excluded. c Normalized to sum to one by dividing each instance of a primary center for a crop by the number of primary centers for that crop (i.e., for a given crop, the weight assigned to a primary center falls as the number of primary centers increases). While the non-normalized measure does not impose this assumption, doing so provides a cardinal measure).

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