We're Borrowing Like Mad. Can the U.S. Pay It Back?

From the U.s. Economics Editor of "The Economist"

In its battle against the financial crisis, the U.S. government has extended its full faith and credit to an ever-growing swath of the private sector: first homeowners, then banks, now car companies. Soon, President-elect Barack Obama will put the government credit card to work with a massive fiscal boost for the economy. Necessary as these steps are, they raise a worry of their own: Can the United States pay the money back?

The notion seems absurd: Banana republics default, not the world's biggest, richest economy, right? The United States has unparalleled wealth, a stable legal tradition, responsible macroeconomic policies and a top-notch, triple-A credit rating. U.S. Treasury bonds are routinely called "risk-free," and the United States has the unique privilege of borrowing in the currency that other countries like to hold as foreign-exchange reserves.

Yes, default is unlikely. But it is no longer unthinkable.