posed to have made to a naïve acquaintance who had ventured to ask the great man what the market was going to do. “It will fluctuate,” replied Morgan dryly. And it has many other distinctive characteristics. Apart from the economic advantages and disadvantages of stock exchanges—the advantage that they provide a free flow of capital to finance industrial expansion, for instance, and the disadvantage that they provide an all too convenient way for the unlucky, the imprudent, and the gullible to lose their money—their development has created a whole pattern of social behavior, complete with customs, language, and predictable responses to given events. What is truly extraordinary is the speed with which this pattern emerged full blown following the establishment, in 1611, o