This article was originally written on the occasion of the seventieth anniversary of the 1929 Wall Street Crash. It was not intended purely as a commemorative or historical piece. It was written because, to Marxists, all the signs were then apparent that another stock price ‘correction’ was in preparation. In 1998 Long Term Capital Management had collapsed, losing $4.6 billion in four months. LTCM was a hedge fund. The details of their activities were arcane, but what they were engaged in was essentially the same practice as was called ‘buying on the margin’ in 1929. In other words they were betting with other people’s money. They had been much admired in high finance. Two of their operators, Myron Scholes and Robert C. Merton, had won the Nobel prize in economics in 1997. Their economic writings were mind-numbingly mathematical. However the fate of LTCM shows they made scant addition to the sum of human happiness. But after all that had never been their intention.