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Adam Smith, Wealth of Nations
Allyn Young. 1928. Increasing Returns and Economic Progress.
James Buchanan and Yong Yoon. 2000. A Smithian Perspective on Increasing Returns.
MRU, Development Economics, "Geography and Development, Trade" and "Paul Romer"
Cowen and Tabarrok, Modern Principles, Chapter on Trade.
Tabarrok, Ted talk.