Notes, Comments and Preliminary results Apr 17 2005 Stephen LeRoy   Positivity and bubbles in overlapping generations models   Abstract  Contact Information  Citation  Full Text  -  Note   Nov 05 2004 Stephen LeRoy   Bubbles and the Intertemporal Government Budget Constraint   Abstract  Contact Information  Citation  Full Text  -  Note   Nov 19 2003 Stephen LeRoy   Expected utility: a defense   Abstract  Contact Information  Citation  Full Text  -  Note