Dyferencjacja rozwoju działalności gospodarczej przedsiębiorstw sektora TSL w Polsce
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The main goal of this paper is analysis of business development differentiation of the TSL sector companies in Poland. The paper is divided into two main parts. In first one, there are presented the results of the fundamental empirical research on differentiation in the sector scope of activities of the TSL sector enterprises in 2007–2009. In second part the author undertook the analysis of dependence between the diversification of activity objects of the surveyed companies and the value of the net revenues from the sale of products (services), goods and materials. For the realization of the article it has been put the research hypothesis stating that between the level of diversification of economic activities of the TSL sector companies and the value of net revenues from the sales of products (services), goods and materials, there exists the significant positive correlation. The recognition of direction and strength of the dependence between the analyzed variables has been done with using of the Spearman's rank correlation.