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Economists from around the industrialized world demonstrate the strength of both theories about the rise of economic inequality: that is it the mechanical consequence of changes in such economic fundamentals as technology and demographic parameters; and that it is the contingent consequence country-specific and time- specific changes in institutions. They find that though institutions always play a crucial role in shaping inequality and sometimes preventing it, still it creeps in.
Javier Ortega (2000) studied this question.