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In page Plutocracy:

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Reasons why a plutocracy develops are complex.[citation needed] In a nation that is experiencing rapid economic growth, income inequality will tend to increase as the rate of return on innovation increases.[1] In other scenarios, plutocracy may develop when a country is collapsing due to resource depletion as the elites attempt to hoard the diminishing wealth or expand debts to maintain stability, which will tend to enrich creditors and financiers. Economists have also suggested that free market economies tend to drift into monopolies and oligopolies because of the greater efficiency of larger businesses (see economies of scale).