Rym Aloui University of Evry, EPEE   99 rue du landy la plaine saint denis, 93210 France   rym.aloui.bs@gmail.com   http://rymaloui.tk/           JEL Areas: E2 : Macroeconomics: Consumption, Saving, Production, Employment, and Investment: General (includes Measurement and Data) D4 : Market Structure and Pricing: General