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The Principle of Declining Share of Foreign Trade says that as a country's population grows and its economic well-being increases, international trade tends to represent a smaller proportion of its GNP. The principle is an expression of a mathematical inevitability. A geographically larger country has a greater probability of possessing both the production capabilities to produce whatever is needed for consumption and a market of sufficient size to consume whatever is produced. A larger country will therefore have less need to supplement either its productive capacity or its markets than will a country with smaller area and population.
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