мировой экономический кризис 1929 – конца 1930-х годов(в русском языке термином "Великая депрессия", как правило, обозначается только кризис этого периода на территории США, в то время как английский термин Great Depression может относиться ко всему миру Юрий Гомон)
мировой финансовый кризис(2007-2009 гг.: The Great Recession was a period of marked general decline (recession) observed in national economies globally that occurred between 2007-2009. The scale and timing of the recession varied from country to country (see map). (Wiki) Андрей Уманец)
Теория большего дурака(The greater fool theory states that the price of an object is determined not by its intrinsic value, but rather by irrational beliefs and expectations of market participants. A price can be justified by a rational buyer under the belief that another party is willing to pay an even higher price. In other words, one may pay a price that seems "foolishly" high because one may rationally have the expectation that the item can be resold to a "greater fool" later. zartus9112)