High Quality Content by WIKIPEDIA articles! The Roaring Twenties, the decade that led up to the Crash,[ was a time of wealth and excess, and despite caution of the dangers of speculation, many believed that the market could sustain high price levels. Shortly before the crash, economist Irving Fisher famously proclaimed, "Stock prices have reached what looks like a permanently high plateau." However, the optimism and financial gains of the great bull market were shattered on "Black Tuesday", October 29, 1929, when share prices on the NYSE (New York Stock Exchange) collapsed. Stock prices fell on that day and they continued to fall, at an unprecedented rate, for a full month