Sonia De lucas-santos UNIVERSIDAD AUTONOMA DE MADRID   MADRID, MADRID 28049   sonia.delucas@uam.es   WWW.UAM.ES           JEL Areas: E2 : Macroeconomics: Consumption, Saving, Production, Employment, and Investment: General (includes Measurement and Data) E3 : Prices, Business Fluctuations, and Cycles: General (includes Measurement and Data)