Rep. Alexandria Ocasio-Cortez speaks about the Green New Deal in Washington, D.C., on May 13. She has shined a spotlight on a once-obscure brand of economics known as “Modern Monetary Theory.”

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Rep. Alexandria Ocasio-Cortez speaks about the Green New Deal in Washington, D.C., on May 13. She has shined a spotlight on a once-obscure brand of economics known as “Modern Monetary Theory.”