The same factors are used to explain differences in the level of output per capita between countries, in particular why some countries grow faster than others, and whether countries converge at the same rates of growth.
同樣這個因素也被用來解釋各國之間存在的人均生產輸出的差異，尤其為何某些國家成長得比其他國家快、而為何某些貧窮國家的成長率比已開發國家高。