IEM Iowa Electronic Market The Iowa Electronic Market [http://tippie.uiowa.edu/iem/] (IEM) is a prediction market run by the University of Iowa and sanctioned by the Commodity Futures Trading Commission [http://www.cftc.gov/files/foia/repfoia/foirf0503b004.pdf] (CFTC). PredictIt [https://www.predictit.org/] is