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- Donald Trump's meme stock has plunged by 70% from its peak last month.
- Trump Media & Technology Group, which owns Truth Social, soared after it went public.
- Experts say powerful figures can drive up stock prices, but the gains can be short-lived.
Donald Trump's meme stock skyrocketed in March but has now crash-landed.
Experts say its explosive rise and dramatic fall show how powerful people can wield their influence to create vast amounts of stock-market wealth — but it doesn't last long without a real business behind it.