"Over a protracted period of good times, capitalist economies tend to move
 from a financial structure dominated by hedge finance units to a structure
 in which there is a large weight to units engaged in speculative and Ponzi
 finance...  The greater the weight of speculative and Ponzi finance, the
 smaller the overall margins of safety in the economy and the greater the
 fragility of the financial structure." - Hyman Minsky, 1992