Memoirs of Extraordinary Popular Delusions and the Madness of Crowds Volume 1

The book chronicles and vilifies its targets in three parts: "National Delusions", "Peculiar Follies", and "Philosophical Delusions".

The subjects of Mackay's debunking include alchemy, beards (influence of politics and religion on), witch-hunts, crusades and duels. Present day writers on economics, such as Andrew Tobias, laud the three chapters on economic bubbles. (summary from wikipedia)