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Unequal resource distribution
The most common use of this concept has not been in examining the unequal distribution of resources among nation states. Such unequal distribution of resources was commonly related to land for agriculture, necessary for population growth. A more recent emphasis has been on differences from the unequal dispersion of technological progress.
The growth of international trade is an aspect of globalization in the later 20th Century (see OECD), which has affected international relations. Increased international trade from the removal of trade barriers has narrowed income distribution among some nation states. Many wealthier countries export non-land-intensive goods and services in return for agricultural and animal products, as illustrated by Japan.