The Global Debt Bomb

From Forbes.com

Whether or not you believe the spending spree was morally justified, you have to be concerned about the prospect of a dismal, debt-burdened fiscal future. More debt weighs heavily on GDP, says Carmen Reinhart, a University of Maryland economist. The coauthor, with Harvard professor Kenneth Rogoff, of This Time It's Different: Eight Centuries of Financial Folly (Princeton, 2009), Reinhart has found that a 90% ratio of government debt to GDP is a tipping point in economic growth. Beyond that, developed economies have growth rates two percentage points lower, on average, than economies that have not yet crossed the line. (The danger point is lower in emerging markets.) "It's not a linear process," she says. "You increase it over and beyond a high threshold, and boom!" The U.S. government-debt-to-GDP ratio is 84%.