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Additional info for A 75 Angle Constraint for Plane Minimal T1 Trees

Sample text

Va(h) is the sum of discounted net expected returns to this unit of land obtained over time by the agent that manages it. It is the discounted sum of periodic returns from market revenues and household subsistence values minus the discounted sum of production costs incurred to obtain these returns. These costs include both market costs and the opportunity costs of the agent’s own labor and capital. The agents that manage agricultural land, particularly land at the frontier, tend to be individual households.

That is, meaningful comparisons of similar products must refer to uniform points of access, and alternative sources of timber volume are not good substitutes unless their access to the processing facility is similar. Therefore, the most common physical data on forest stocks, with their widely varying differences in accessibility, are imprecise estimates of the forest inventory that is necessary to address modern policy questions about either marketvalued products like timber or fuelwood or non-market values like biodiversity or carbon sequestration and global warming.

5 5 Nair (1993) describes the basic elements of shifting cultivation. , Tomich et al. 1998, 2001). Angelsen (2007) provides a formal economic model. The Pattern of Forestry in the Course of Economic Development Increasing land value 19 Increasing land value Va1 Va1 Va2 Tr Tr Va1 (h) Va1 (j) Vf2 Va2 (h) -Vf1 (j) -Vf1(h) A D h B1 A C1 Vf1 First home territory in the first period (Va1 , Vf1 ), and in the second period (Va2 , Vf2 ) after some depletion of soil nutrients and some forest removal. D j B C Decreasing access Vf1 A newer second home territory after further depletion of the soil nutrients at the first site.

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