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To be able to use rich-country methods of production requires rich-country infrastructure—roads, railways, telecommunications, factories, and machines—not to mention rich-country educational levels, all of which take time and money to achieve. Yet the gaps between rich and poor provide plenty of incentives to make the investment in that infrastructure and equipment, and, as Robert Solow showed in one of the most famous papers in all of economics, average living standards should draw closer over time.4 Why this has not happened is a central question in economics. Perhaps the best answer is that poor countries lack the institutions—government capacity, a functioning legal and tax system, security of property rights, and traditions of trust—that are a necessary background for growth to take place.
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