Billionaires minted through inheritance outpaced self-made billionaires last year for the first time in a decade. Related storiesIn recent years, rates of economic opportunity have begun to fall again. Rates of economic opportunity have declined steadily since 1940, Opportunity Insights data shows. He says that's why there are fewer self-made billionaires today than there were in the past. "I think there's much work to be done to try to restore rates of economic opportunity to those observed several decades ago," he said.

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Persons: —, Max Kunkel, Matthew Staiger, Staiger, Forbes, heiresses, Kunkel Organizations: Service, UBS, Harvard, Insights, Business, Economic