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FAQ developed a forest product trade model by applying GFPM (Global Forest Product Model) to trading fifteen products among sixteen nations in Asia and other seYen nations over the time horizon tiJI 2020. At this moment, there remain some problems on this kind of the modeling approach to policy analysis from the viewpoint of comparative dynamics. This paper is to clarify possibility and limitation of such a model for policy analysis on timber trade by reviewing the report from USTR on the tariff liberalization of forest products with a use of GFPM and CGTM (CINTRAFOR Global Trade Model)

The purpose of this study is to explain the justification for taxing corporate rents as a funding source for Sustainable Development Goals (SDGs), and to calculate a normative corporate tax rate that takes into account rents for corporations, especially multinational corporations, and to recommend that the current corporate tax surcharge be used to finance social common capital. Considering global tax avoidance, we propose that many countries cooperate to raise their corporate taxes and finance SDGs. Aiming to calculate a normative corporate tax rate with rents for each country, we applied the total factor productivity method for calculating the markup rate, assumed long-term interest rates to be the marginal efficiency of capital, and developed a normative corporate tax rate calculation method. Using a Cobb–Douglas function in dynamic pseudo-competitive profit optimal conditions, we calculated the rents of 234 American corporations listed on the S&P 500 index. The normative tax rates from 1982 to 2014 for these companies are stable at 40 to 60%, whereas corporate income tax has gradually decreased from 40% to less than 30%. Thus, the amount lost due to the race to the bottom of corporate taxes can be used to finance the SDGs.

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