#11: Hetty Green (The Cold-Oatmeal Economy)
Known as the “Witch of Wall Street,” Hetty Green was a millionaire known for her penny-pinching ways. She refused to spend money on anything unnecessary, but her frugality got extreme. Green would even heat her cold oatmeal using office radiators instead of using hot water. She wore the same unwashed black dress for years and lived in a modest home while collecting great wealth.

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