Industry clusters in Ohio and Sweden, 1975-1995

The purpose of the present paper is twofold. First, we formulate a general method of identifying clusters of economic activity in a country or region. The methodology is based on generally available industry data and does not start from a priori notions of geographic or technology clusters. Second, the proposed methodology is then used to identify the main clusters of economic activity in Ohio and Sweden and their evolution over the last twenty years.