5 centuries of bubbles and bursts
History is replete with financial frenzies that seem ridiculous in hindsight, but were viewed as anything but at the time.
Not since the Depression was there so much speculation on Wall Street - this time in promising but in many cases profitless companies with ".com" in their names. After the party came crashing to an end in 2000, tech stocks lost four-fifths of their value.
NEXT: 2003-07: Real estate