Excerpt:
“Romer, in a series of papers in the 1980s, fundamentally changed the way economists think about the role of technology in economic growth. Since then, he has studied why some countries stay poor even when they have access to the same technology as wealthier ones. He eventually realized something that seems obvious to any nonacademic, that poor countries are saddled with laws and, crucially, customs that prevent new ideas from taking shape. He concluded that if they want to be rich, poor countries need to somehow undo their invidious systems (corruption, oppression of minorities, bureaucracy) and create an environment more conducive to business. Or they could just start from scratch.”

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