" Out of that belief, thus instilled, then comes action—the bidding up of values, whether in land, securities, or, as recently, art. The upward movement confirms the commitment to personal and group wisdom. And so on to the moment of mass disillusion and the crash. This last, it will now be sufficiently evident, never comes gently. It is always accompanied by a desperate and largely unsuccessful effort to get out. Inherent "

― John Kenneth Galbraith , A Short History of Financial Euphoria