铁路多经物流特定产出范围经济的实证研究

An Empirical Study on the Product-specific Economies of Scope in Diversified Railway Logistics

通过范围经济的相关理论,实证研究了铁路多经物流的二次成本模型.结果表明:铁路多经物流3种产出的范围经济均呈倒"U"形,且在均值水平的[60%,500%]都存在范围不经济性,其中仓储业的范围不经济性最小.当仓储业的产出水平扩大至均值产出水平的250%,交通运输业和运输辅助业的产出水平扩大至均值产出水平的200%时,可以最大程度地减小其范围不经济性,若继续扩大产出水平,则范围不经济性会显著增大.

Quadratic cost function of diversified railway logistics was analyzed through the relevant theory on scope economics. The empirical findings showed that the scope economies of diversified railway logistics were inverted ＂U＂-shape, and three product-specific economies of scope did not exist on mean output level. The scope diseconomies of warehousing were lowest. The diseconomies of scope were gradually reducing until the output level expanding to 250%. For transportation industry and transports supporting industry, their output level need expand to 200%. When the output level continued to expand, product-specific diseeonomies of scope would significantly increase.