It is 9.42am on Saturday. A young man from Tzaneen gets out of a taxi on William Nicol Drive in Sandton and skitters towards Montecasino with his tattered backpack swaying vigorously. He left home at the crack of dawn to come to the city of gold with hopes of improving his lot. He walks briskly past dazzling gaming machines and stops at the end of a corridor where the walls are lined with lists of the people registered to attend Billion Forex Group’s foreign-exchange (forex) seminar. In the conference room, attendees stare at laptop screens flashing with colourful candlestick charts and zigzagging lines. Billion Forex Group founder Blaine Josephs announces a slight delay in the seminar. "Some students called to say they were still on their way." There is sudden silence. The expectant audience of about 300 mostly young black men, some women and a few older people is made up of engineers, artists, bankers, health caregivers and students who have come to learn about trading in a market...

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