Hal Varian: The Economics of Internet search
http://simprof.pl/?myrka=portal-o2.pl-randki&f31=9d http://www.youtube.com/watch?v=CT2k4z0xPwE&feature=player_detailpage
http://artefact-mag.com/helmuth-newton/feed Apropiación Incluyente Google Precios diferenciales Subastas Varian