Arie Kapteyn, Sara van de Geer, Huib van de Stadt, and Tom Wansbeek, "Interdependent Preferences: An Econometric Analysis", Journal of Applied Econometrics, Vol. 12, No. 6, 1997, pp. 665-686. This paper uses confidential data from Statistics Netherlands. Please contact A. Kapteyn (A.Kapteyn@kub.nl) for further information.