摘要:This paper examines the divergence of per capita real gross state product in the United States from 1963 to 1986. By extending earlier analyses of increasing regional income inequality, this paper hypothesizes that regional inequality is increasing due to the existence of a 100-year growth pole cycle that relies on the emergence of major product innovations. Each growth pole cycle, leading to separate 50-year periods of increasing, then decreasing, regional inequality, is hypothesized to generate recent increases in inequality. Regression analysis, using gross state product data, indicates that three sectors-transportation, communications, and public utilities; retail trade; and finance, insurance, and real estate-are the leading sectors for the onset of increasing regional inequality.