Trickle-down innovation and the longevity of nations. Amitabh Chandra, June 1, 2019, Paper, “The association between income and life expectancy is so robust and persistent across countries that it has a name, the Preston Curve, named after the economist who first described it. 1 The strength of the association begs the question: must citizens of poorer countries wait for their economies to grow before they can expect to enjoy the life expectancies of wealthier nations? Or can longevity improve, even in the absence of economic gains? The answer has important implications for human wellbeing around the world.Link