The co-ordinated effort by users of the online forum Reddit to drive up the share price of GameStop and other companies is designed to turn the screw on short-sellers. To the layman, the dynamics at play here can seem dizzyingly labyrinthine. But a good place to start is by understanding what short-selling is – and how the Wall Street wizards who do it could end up being wrong-footed by a group of amateur traders.
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