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The model consists of two symmetric competing forest sectors--one for the national forest sector under investigation; and one for competing forest sectors of other countries. Each forest sector covers all activities ranging from timber growth to the consumption of forest industrial products such as paper (pulp), sawnwood and panels. This is represented in the model through eight modules: Demand of products, product market, forest industry, roundwood market, forest management, inventory of standing volume, construction sector and regulation of the forest sector. In this paper each of the modules is described and the mathematical equations are presented.</abstract>
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