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One of the most important principles in the company is the principle of efficiency which consists in achieving the highest possible economic effects with minimum economic investment. In this paper, we present a nonparametric efficiency analysis, bus subsystems of public transport passengers Belgrade City, a sample of five small, three medium and two large companies. It was shown that the overall bus transport system has a low level of overall efficiency, only 0.66%. It was found that the economies of scale has no significant impact on the level of efficiency when it comes to classification that was generated for this study. Small and medium companies are in a worse situation than large companies when it comes to economies of scale. These results should indicate the necessity of the transport system and bus companies organizational and technological redesign

A nonparametric efficiency analysis of bus subsystem in Belgrade city, using DEA methods