The American economy revolves around credit. We use credit cards for everyday purchases like gas and groceries, but we also take out major loans to pay for school, homes and automobiles. But what if we lived in a world without credit? How would this affect our financial system and our daily lives? Would it reshape human history? On the last episode of this season of Downside Up, Chris Cillizza considers these questions with sociologists Sarah Quinn and Monica Prasad, and New York Times business reporter Emily Flitter.

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