Stephanie Kelton's The Deficit Myth explains modern monetary theory (MMT) and its implications for how we think about government spending. Kelton, an economist at Stony Brook University who advised Bernie Sanders's presidential campaigns, argues that the United States, as a currency issuer, cannot run out of money the way a household or business can. Federal deficits are not inherently bad; what matters is whether spending causes inflation by exceeding the economy's productive capacity. Kelton contends that we have been misled by a household analogy that does not apply to sovereign currency issuers, preventing investment in infrastructure, healthcare, and climate action we could easily afford. The book is accessible to general readers, explaining economic concepts without jargon. Kelton addresses objections and explains how MMT relates to debates about taxes, trade, and the Federal Reserve. Critics argue she underestimates inflation risks and the difficulty of politically managing spending. Supporters find her framework liberating. The Deficit Myth does not offer a policy program but an analytical framework that shifts what seems possible. Essential reading for anyone interested in economic policy, government finance, or understanding the debates that shape what our society invests in.