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1·The reason is the spatial concentration of population and resources had the effect of increasing returns to scale.

原因是人口和资源的空间集聚产生了规模收益递增的效应。

2·As a result, increasing in labor productivity inside cluster is endogenous and shown up by the characteristics of increasing returns to scale.

因此，产业集群内劳动生产率增长是内生的，且呈现规模收益递增的特征。

3·Emphasizing on the increasing returns to scale, spillover effect and accumulation of specialized human capital, the endogenous growth theory is a breakthrough in this regard.

它所强调的规模收益递增、外溢效应、专业化人力资本积累等，是对传统经济增长理论的重大突破。

4·As for regional economy, because of the intra-industrial and inter-industrial relationship, increasing returns to scale has been shown up not only in enterprises level but also in industry level.

对于区域经济来说，由于产业内和产业间联系，规模收益递增不仅体现在企业中，而且还体现在行业中。