We develop a two-country (Home and Foreign) by two-good (consumption good and investment good) by one factor (capital) endogenous growth model with international knowledge spillover to study the relationship between an import tariff and economic growth and welfare. First, unlike the past literature, we do not need to make an assumption such that the growth rates between countries are identical in a balanced growth path (BGP). Second, we show that there exists a unique and saddle-point BGP with both countries being incompletely specialized. Third, a higher import tariff on the consumption good in the domestic country may boost (reduce) the rate of economic growth when the foreign (domestic) country has an absolute advantage in the investment good. Finally, a rise in the tariff rate by one country may improve world welfare under some parameter spaces.two-country endogenous growth model, international knowledge spillover, import tariff, economic growth, welfare
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