[1] Univ Wisconsin, Ctr Res Int Econ, Milwaukee, WI 53201 USA
[2] Univ Wisconsin, Dept Econ, Milwaukee, WI 53201 USA
[3] Charles Schwab & Co Inc, Risk Analyt Modeling, Model Risk Oversight, Denver, CO USA
[4] Lake Forest Coll, Dept Econ Business & Finance, Lake Forest, IL 60045 USA