Over the past year alone, the public debt of the United States rose sharply from 41 to 53 percent of gross domestic product (GDP). Under reasonable assumptions, the debt is projected to grow steadily, reaching 85 percent of GDP by 2018, 100 percent by 2022, and 200 percent in 2038.
However, before the debt reached such high levels, the United States would almost certainly experience a debt-driven crisis—something previously viewed as almost unfathomable in the world's largest economy. The crisis could unfold gradually or it could happen suddenly, but with great costs either way. The tipping point is impossible to predict, but the United States is already hearing concerns about its fiscal management from some of its largest creditors, and the country is uncomfortably vulnerable to shifts in confidence around the world.