Poverty was the norm for most of human history. Then, starting in Britain in the 18th century, economic growth took off. So what happened? Economists have theories about the origins of the Industrial Revolution, from geography to culture to institutions. In a new book, Mark Koyama and Jared Rubin assemble the literature to give readers a big-picture view of how the world went from poverty to widespread prosperity. Mark is an Associate Professor of Economics at George Mason University, and Jared is a Professor of Economics at Chapman University. They are the authors of How the World Became Rich: The Historical Origins of Economic Growth.