Technological Distance, Growth and Scale Effects
构建了一个内生增长模型，其中规模效应可能为正或负，但渐近消失。机制在于更多企业活动导致专业化，技术距离增加减少企业间知识溢出，为消除规模效应的模型提供了微观基础。
We present an endogenous growth model in which the scale effect may be positive or negative, but vanishes asymptotically. The mechanism behind this result provides a microfoundation for models that exploit the interaction of growth and market structure to remove the scale effect. When more firms are active, the economy is more specialised in that firms are less likely to work on related problems. This increase in technological distance reduces the spillovers between firms. A larger economy with more firms accumulates more knowledge. However, the spillovers that benefit a firm do not necessarily increase because of the differentiation of the knowledge stock. Copyright 2002 Royal Economic Society