Theories of economic growth at the regional and national level, have expanded the traditional production function of the Solow model towards a wide function that collects conditioning factors of labour productivity, measured by R & D expenditure, the number of patents, the human capital, the...

The theory of economic growth covers institutional market and company internal factors that explain the disparities in well-being among countries, in a given period. It also questions welfare growth dynamics that leads to convergence or divergence of per capita wealth levels. (Solow, 1956-1957;...