Ricardo–Viner model

The Ricardo–Viner model, also known as the specific factors model, is an extension of the Ricardo model used in international trade theory. It was due to Jacob Viner's interest in explaining the migration of workers from the rural to urban areas after the Industrial revolution. Unlike the Ricardian model, the specific factors model allows for the existence of factors of production besides labor. In other words, labor is mobile, while the two other factors of production are immobile (sector specific) as opposed to the Ricardian model where labor is immobile internationally, but mobile between two sectors of an economy.