Joint labour supply dynamics of older couples / by Pierre-Carl MichaudA collective retirement model: identification and estimation in the presence of externalities / by P.C. Michaud, F.M.P. VermeulenHealth and wealth of elderly couples: causality tests using dynamic panel data models / by P.C. Michaud, A.H.O. van SoestDynamic panel data models and causality: applications to labor supply, health and insurance / Pierre-Carl Michaud