Using variables indexing the scope of economic activities. In U. S. communities at two points in time, we elaborate a technique for identifying the dimensions underlying an existing typology and the 56 largest SMSA's are ranked along
to the functional system for the prevailing discrete typologies. Using variables indexing the scope of economic activites in U.S. communities at two points in time, we elaborate a technique for identifying the dimensions underlying an existing typology, and the 56