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Scavengers are people who recover recyclables from waste and use it for self consumption and/or trade. Though this group of society exists in many societies, the research in this area is scarce. There few research made in western world, more in developing countries. In Lithuania this area is quite uninvestigated. The paper present this paper the results of ethnographic research conducted in year 2006-2008 in Lithuanian dumps. The nature of this paper is descriptive. We introduce general characteristics of scavengers' work and their earnings in various countries as well as in Lithuania. [ABSTRACT FROM AUTHOR]

A review of the principles of differentiation of network tariffs is rather important, because the process of the implementation of new tariffs has already started. To avoid mistakes and to choose the most optimal structure of tariffs, it is expedient to use the best experience of developed countries. The principles of the daytime differentiation after restructuring the power sector were left mainly unchanged. In addition to separated network activity the differentiation according to the voltage level was introduced. Unfortunately, economy of scale is still ignored. In this paper, the method of transposing the existing differentiation according to voltage level into differentiation according to the amount of energy sent through the network is proposed. The tight relation between these two principles is discussed. Seeking to apply the principle of economy of scale, the new method of grouping users according to the level of electricity consumption as the most appropriate approach is developed. On the basis of the analysis a mathematical model is proposed, and results of its testing are presented. [ABSTRACT FROM AUTHOR]