“…Such models have a surprisingly long history: early contributions include the analysis of linear regressions with mismeasured regressors by Frisch (1934) and the analysis of Cobb-Douglas production functions by Marschak and Andrews (1944). Now, partially identified models are common in virtually all parts of economics and econometrics: measurement error (Klepper and Leamer, 1984;Horowitz and Manski, 1995), missing data (Manski, 1989(Manski, , 1994Horowitz and Manski, 1998;Manski and Tamer, 2002), industrial organization (Tamer, 2003;Haile and Tamer, 2003;Ho and Pakes, 2014;Pakes et al, 2015), finance (Hansen and Jagannathan, 1991;Hansen et al, 1995), labor economics (Blundell et al, 2007;Kline et al, 2013;Kline and Tartari, 2015), program evaluation (Manski, 1990(Manski, , 1997Manski and Pepper, 2000;Heckman and Vytlacil, 2001;Bhattacharya et al, 2008Bhattacharya et al, , 2012Shaikh and Vytlacil, 2011), and macroeconomics (Faust, 1998;Canova and De Nicolo, 2002;Uhlig, 2005). The references above are far from exhaustive and simply illustrate the widespread popularity these types of models now enjoy in economics.…”