These things spread through share dealing like waves, going up and down as the prices rise and fall. Here is an example....
On the day of 9/11 Airline shares dropped and people would become afraid to fly, short term. So hotel shares would go down, fuel suppliers shares would go down, too. People might decide to travel by rail, as an alternative, so railway firm's shares may rise. Onboard services, on train,s may be busier and so those company's shares would rise, whereas airline catering shares would fall. Bets on the Stock Exchanges would be made on these various shares going up and down. If all the bets came in, then a lot of money could be made.
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