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Some people enjoy higher incomes than others. Some are promoted faster. Some are leaders on more important projects. The human capital explanation is that inequality results from differences in individual ability. The usual evidence is on general populations, as is Becker’s (1975) pioneering analysis of income returns to education, but the argument is widely applied by senior managers to explain who gets to the top of corporate America—managers who make it to the top are smarter or better educated or more experienced. But, while human capital is surely necessary to success, it is useless without the social capital of opportunities in which to apply it.