When an affirmation has been sufficiently repeated and there is unanimity in this repetition—as has occurred in the case of certain famous financial undertakings rich enough to purchase every assistance—what is called a current of opinion is formed and the powerful mechanism of contagion intervenes. Ideas, sentiments, emotions, and beliefs possess in crowds a contagious power as intense as that of microbes. This phenomenon is very natural, since it is observed even in animals when they are together in number. Should a horse in a stable take to biting his manger the other horses in the stable
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