摘要：
Economic growth models have been extensively used by planners studying the urban environment. Urban economies change, and these changes must be studied, evaluated, and for many purposes, forecasted. The economic model most frequently used—economic base—focuses on demand elements. Supply factors, though not ignored, have been less thoroughly studied, and little effort has been made to include them in formal models, yet technological change and its impact on urban economic structures and interurban locational elements has made the study of demand factors alone an in-sufficient basis for the analysis of long-term growth in the urban economy. It is argued that the time has come for urban model builders to change their emphasis when the focus is on urban economic growth. Some aspects of the problems involved when attempts are made to fit supply factors into these analytic structures are discussed.
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