Abstract and Keywords
This article discusses the implications of four models related to trade, immigration, and cross-border investment. These four models are: Hecksher-Ohlin, Samuelson-Jones and Ricardo-Viner, neo-Ricardian, and Economies of Scale. The first three models assume constant returns to scale, but all models make the conventional assumption of diminishing marginal returns to any individual factor. The article discusses each model in detail, focusing on trade in products and cross-border migration and investment.
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