Research and discussions on international trade strategies and economic growth performance goes back to Adam Smith’s major contribution “Wealth of Nations”. Although there is a common belief that openness in international trade has positive contributions to economic growth, theory and testing of models entails certain economic difficulties. We face two alternative approaches in testing long-term implications of implemented policies and long run productivity increases.
Initial attempt, is known as the neoclassical growth approach, which carries traditional growth properties. In this approach, majority adopting the Solow growth model emphasizes that long-term growth process relies on exogenous technological growth rate. Although empirical studies show a positive correlation between investment and growth of Per capita income, these models display level effects but not growth effects of investment changes. Basic reason for such a finding is the existence of diminishing returns. Under constant growth rate of exogenous technology, the economy experiences the process of income growth (level effect). The neoclassical growth theory is based on the assumption that every firm or economy can take and adopt a new technology without bearing any cost. Therefore, these models cannot capture the spillover effects of technology via international flows of capital goods and knowledge. Another assumption that bother neoclassical growth model is the perfect competition. However, the main characteristic of the new growth models that produce long-run growth effect is the imperfect competition of goods and factor markets.