Ralph S.J. Koijen is  the AQR Capital Management Distinguished Service Professor Of Finance and Fama Faculty Fellow at the University of Chicago Booth School of Business. Professor Koijen’s research focuses on finance, insurance, and macroeconomics. His research has been published in the American Economic Review, Econometrica, the Journal of Political Economy, the Journal of Finance, the Review of Financial Studies, and the Journal of Financial Economics. His research has been covered in popular media, such...