A production-possibility frontier is a budget constraint presented by the limitation of available factors of production. Under autarky this is also the limitation of consumption by individuals in the country. However, the benefits of international trade are generally demonstrated through allowance of a shift in the consumption-possibility frontiers of each trade partner which allows access to a more appealing indifference curve.
On "toolbox", Hecksher-Ohlin and Krugman models of international trade, the budget constraint of the economy (its CPF) is determined by the terms-of-trade (TOT) as a downward-sloped line with slope equal to those TOTs of the economy (The TOTs are given by the price ratio Px/Py, where x is the exportable commodity and y is the importable).

Many goods
International economics
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