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Stock market bullMoonset/Getty ImagesLeveraged ETFs tracking Nvidia's performance have soared this year.The leveraged funds focused on the AI ​​giant have attracted $5 billion from investors.This amount is leagues beyond other single-stock…

Warren Buffett.Drew Angerer/Getty ImagesWarren Buffett invested a vital $3 billion in Dow Chemical at the height of the financial crisis.In return, Berkshire Hathaway received preferred stock paying a yearly dividend of 8.5%.Buffett's…