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.”

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.”