New economic geography discusses the nature of economies of scale, transportation costs, factor mobility, input-output linkages and their interactions through the space explanation of DS model.
通过D - S模型赋予空间解释，新经济地理学对规模经济、运输成本、要素流动和投入产出联系的性质及其相互作用进行了深入的探讨。
These reductions may reflect manufacturers' marketing policies, economies of scale in the material production, or scale economies in transportation.
这些下降可能反映了制造商的营销政策，经济规模在物质生产、规模经济的运输。
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