In December of 1919, Charles Ponzi—an Italian immigrant of unremarkable stature—sat in a rented office in Boston, scheming his way toward wealth. He had stumbled upon an idea involving international reply coupons, those modest slips of paper that allowed correspondents to prepay return postage across borders. In theory, one could purchase them cheaply in war-ravaged … Continue reading Ponzi scheme. The Geometry of Greed