This document outlines the Linder Hypothesis, an alternative theory to the Heckscher-Ohlin (H-O) model of international trade. The Linder Hypothesis, proposed by Swedish economist Staffan Linder, argues that differences in domestic demand, rather than factor endowments, are the major drivers of trade in manufactured goods. Specifically, it asserts that countries will first produce goods for their domestic markets and then export surpluses to other countries with similar demand patterns and per capita incomes. The hypothesis concludes that while specific export predictions are difficult, international patterns of income and demand largely determine trade volumes in manufactured products between countries.