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Klabin is the largest forest company of Parana. The company owns most of the Parana’s reforestation, provide the majority of sawnwood supply and it is responsible by highest consumption of Parana’s pulpwood. These characteristics give the company a considerable market power and an ability to infl uence the formation of timber price. The objective was to contribute to the understanding of the Klabin’s infl uence on the formation of timber prices in Parana. By using Student t test the price of pulpwood and sawnwood within and outside of Klabin’s operation area in 2008 was compared. The results indicated no difference among prices in regions that could be considered justifi ed by the power of oligopoly and oligopsony from the company; in other words, the company has market power, but does not use it.