The keiretsu system which involves tightly knit corporate and cultural relationships between Japanese manufacturers, wholesalers and retailers is a form of: Question 5 options: 1) Economic Bloc 2) Protectionism 3) Caste system 4) Social institutionAccording to the Heckscher-Ohlin model what drives international trade? Question 6 options: 1) Differences in product endowments and factor intensities 2) Differences in factor productivity and wage rates 3) Differences in factor endowments and factor intensities 4) Differences in factor productivity and inflation