This paper provides an overview of the Global Trade Analysis Project (GTAP) Data Base and its latest release, version 9. The GTAP Data Base has been used in thousands of economy-wide analyses over the past twenty-five years. While initially focused on supporting trade policy analysis, the addition of satellite accounts pertaining to greenhouse gas emissions and land use has resulted in a surge of applications relating to climate change as well as other environmental issues. The Data Base comprises an exhaustive set of accounts measuring the value of annual flows of goods and services with regional and sectoral detail for the entire world economy. These flows include bilateral trade, transport, and protection matrices that link individual country/regional economic datasets. Version 9 disaggregates 140 regions, 57 sectors, 8 factors of production, for 3 base years (2004, 2007 and 2011). The great success enjoyed by this Data Base stems from the collaboration efforts by many parties interested in improving the quality of economic analysis of global policy issues related to trade, economic development, energy and the environment.

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Our purpose is to undertake a comparative analysis of the likely impact of tariff reduction under the Trans-Pacific Partnership (TPP) on various macro and trade variables of the Indian economy under different scenarios. The TPP was concluded in October 2015, but it is yet to be ratified by the partner countries, and while Asian giants like India, China and Korea have not joined the TPP, there are some talks about their joining the partnership in future. Ours is a unique study that evaluates India's perspective on joining the TPP, in terms of tariff reduction, and not in terms of the removal of non-tariff barriers. We employ the widely used standard Global Trade Analysis Project (GTAP) model for this exercise. This is a unique framework with a global economy-wide approach, in a Computable General Equilibrium (CGE) setting. Five different scenarios of complete integration in terms of tariff reduction between different regions are simulated using the GTAP model. Under each scenario, the tariff among members of a group of regions is eliminated, but is unchanged for other regions. Higher welfare arising from allocative efficiency comes with the cost of a relatively lower consumption of domestic products and investment, resulting in a loss in terms of GDP. Therefore, we conclude that there are mixed prospects and no strong reason for India to pursue being part of the TPP in future, from a perspective of tariff reductions.

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