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...Ecb lamfalussy fellowship working paper series programme no june theoretical notes on bubbles and the current crisis by alberto martin jaume ventura note this should not be reported as representing views of european central bank expressed are those authors do necessarily reflect in all publications feature a motif taken from banknote can downloaded without charge http www europa eu or social science research network electronic library at ssrn com abstract id we dedicate to memory paul samuelson best economist twentieth century first one understand that pyramid schemes possible might raise welfare even if rational well informed thank fernando broner francesco caselli pierre olivier gourinchas chris telmer for comments an earlier draft roger farmer nobu kiyotaki helene rey stavros panageas very helpful discussions also goncalo pina robert zymek excellent assistance has been prepared under program sponsored both crei universitat pompeu fabra ramon trias fargas barcelona spain e mails amar...