The theory that countries will produce and export goods that require resources (factors) which are relatively abundant, and import goods that require resources which are in relative short supply. Bertil Ohlin’s (1967) model of international trade states that those products a country or region produces relatively better than the competitors have a comparative advantage, and that comparative advantage dictates who trades what, and with whom. Andreson (2010) Geog. Compass 94–105 explains this very clearly.