1968: As tech stocks boom, H. Ross Perot takes his Electronic Data Systems public for $16.50 a share, or 118 times earnings. (Perot had steadfastly kept his company private, refusing 17 offers to do an IPO, until investment banker Ken Langone declared that he could sell the stock for over 100 times earnings.) By early 1970, the stock is at $160.

John Brooks, The Go-Go Years (Weybright and Talley, New York, 1973), pp. 16-18.

1836: The New York Stock Exchange prohibits its members from trading in the streets outside. But open-air trading persists under the nickname of "the Curb," which ultimately becomes the American Stock Exchange.