When is high turnover cheaper? A simple model of cost tradeoffs in a long-distance truckload motor carrier, with empirical evidence and policy implications / Stephen V. Burks (University of Minnesota Morris, University of Minnesota Twin Cities, Center for Transportation Studies and IZA), Arne Kildegaard (University of Minnesota), Morris Jason Miller (Michigan State University), Kristen Monaco (Federal Maritime Commission) ; IZA Institute of Labor Economics