Top economies face 'population collapse' as fertility rates drop, and something's got to give, study says

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• Falling birth rates have put major global economies on the path toward "population collapse," according to a report from McKinsey Global Institute. By 2100, some counties could see their populations tumble 20%-50%.

Forget fiscal deficits. Much of the world is facing a "youth deficit" as people have fewer children, setting up top economies for massive population declines, according to a study from the McKinsey Global Institute that was published on Wednesday.