The book The Deficit Myth by Stephanie Kelton caused me to experience several lightbulb moments. Before reading this book, I didn't understand whether central banks truly could create money out of thin air, and why some countries (USA, UK) seem to have ginormous amounts of national debt without running into trouble, whereas other countries (Greece, Argentina) did experience tangible crises because of their national debt. Now I feel that I do understand and it all clicks, even though I was not persuaded to believe in the book's policy recommendations, such as a job guarantee.