‘The Great Crash’ by John Kenneth Galbraith is the definitive account of the Wall Street crash of 1929. From the relative calm of 1954, Galbraith captured the frenzy of the soaring rise, the searing collapse and ultimately the stunned devastation of that dramatic Autumn. Toward the end of the book, in words that resonate strongly today, he chose to comment on whether another crash would come: ‘No one can doubt that the American people remain susceptible to the speculative mood – to the conviction that enterprise can be attended by unlimited rewards in which they, individually, were meant to share.…