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If democracy is a social contract, why don\u2019t we allow everybody who is willing to sign it? Why don\u2019t we have open borders for immigration?\n\nIn their book "Streets of Gold: America's Untold Story of Immigrant Success," Princeton University\u2019s Leah Boustan and Stanford University\u2019s Ran Abramitzky provide insights from big data to explore how immigration shaped the United States by looking at the economic legacies of immigrants and their children. On this week\u2019s encore episode, hosts Luigi Zingales and Bethany McLean talk with Boustan to unpack how immigrants and their progeny have impacted jobs, wages, and housing prices for native-born Americans. Conversely, how do immigrants\u2019 countries of origin overcome obstacles to socioeconomic change when many of their most-motivated citizens leave? Can data move the U.S. immigration debate beyond the current border crisis?