In the traditional neo-classical growth model, developed by Robert Solow and Trevor Swan in the 1950s, the output of an economy grows in response to larger inputs of capital and labor (all physical inputs). To the neo-classical growth models, non-economic variables, such as human health, skills, knowledge, etc., have no function in the growth process of an economy. This line of thought was described as the Exogenous growth theory and it does not explain why countries with little capital and labor grow more than countries with abundance of these resources.
A new theory described as the endogenous growth theory emerged in the 1980s, particularly due to the works of Paul Romer and his associates in response to the postulations of the exogenous theorists. They argued that economic growth and development in most fast developing economies, particularly, those of the East Asian developing countries, where the economies have continued to grow for well over three decades, demonstrated quite the contrary. The argument is that, it is not only technology, which is the main driving force accountable for maintaining such high growth performance in the economies, but that there were other factors which are outside the realm of the neoclassical growth model.
A new theory described as the endogenous growth theory emerged in the 1980s, particularly due to the works of Paul Romer and his associates in response to the postulations of the exogenous theorists. They argued that economic growth and development in most fast developing economies, particularly, those of the East Asian developing countries, where the economies have continued to grow for well over three decades, demonstrated quite the contrary. The argument is that, it is not only technology, which is the main driving force accountable for maintaining such high growth performance in the economies, but that there were other factors which are outside the realm of the neoclassical growth model.