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In the article the authors suggest evaluating the level of diversification using Herfindahl-Hirschman index that reflects the economic activity concentration within the certain timespan. The study of the index in dynamics for Berezovsky company town located in Kemerovo region shows the downward tendency in economic activity concentration whereas its factors remain ambiguous. The research concludes that, on the one hand, a low level of investments in diversification projects does not act upon the diversification process, on the other hand, socio-economic targets of diversification does not correlate with economic structural changes. Thus the diversification process has low effectiveness.