John Meriwether assembled the smartest team on Wall Street. In the 1980s, he combed Harvard and MIT for geniuses to join him at Salomon Brothers and make the investment bank a fortune with arbitrage - the trick of buying an asset cheap in one place and quickly selling it for a profit in another.

When he parted ways with Salomon Brothers, Meriwether took his "nerds" to set up a hedge fund. They prospered - making themselves and their clients rich. Two employees even picked up a Nobel Prize. But Long Term Capital Management operated in the real world - where projections and charts and formulas can't protect you from political chaos and economic turmoil.

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Shopping used to be adversarial. Shoppers and store owners would bargain and haggle over prices. What one person got for $1, the next guy bought for £1.25. And there were no returns. It was unfair and stressful - and made shoppers distrustful that they were getting a good deal. John Wanamaker changed all that.

Wanamaker thought about being a preacher before setting up as a clothes merchant. So he built a retail empire built on fairness and trust. Price tags appeared in his stores - promising everyone would pay the same. And if you weren't happy - you could return your purchase. This was so unusual that Wanamaker even won the praise of a US President.

AND to see Joseph Monroe Bennett's magnificent moustache for yourself go to: https://archives.upenn.edu/exhibits/penn-people/biography/joseph-monroe-bennett/

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Why have so many tiny start-ups come from nowhere to take down huge established corporations? Is it because the incumbents were dumb? Harvard Business School professor Clayton M Christensen decided to explore these David versus Goliath battles - and came up with a theory to explain why seemingly solid businesses suddenly lose market share... disruptive innovation.

In his hit book, The Innovator's Dilemma, Christensen explored how flawed products from small companies can suddenly catch on, disrupt the market and steal customers from established corporations. Christensen - a life-long Boy Scout - was an odd champion for "disruptive innovation", but his ideas have totally changed the business landscape.

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