Pump and dump, aka market manipulation.
NFTs are a great example: Basically worthless in one moment, then suddenly propped up by a few people spending hundreds of thousands and even millions of dollars on them. So the prices skyrocket and other people buy lots of them and the price further goes up. The initial investors then start selling theirs for a profit and soon after the value plummets as people realize it was not worth that much.
He did that with stocks.
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