The U.S. government is prepared to lend more than $7.4 trillion on behalf of American taxpayers, or half the value of everything produced in the nation last year, to rescue the financial system since the credit markets seized up 15 months ago.

Bernanke’s Fed is responsible for $4.4 trillion of pledges, or 60 percent of the total commitment of $7.4 trillion, based on data compiled by Bloomberg concerning U.S. bailout steps started a year ago.

“Too often the public is focused on the wrong piece of that number, the $700 billion that Congress approved,” said J.D. Foster, a former staff member of the Council of Economic Advisers who is now a senior fellow at the Heritage Foundation in Washington. “The other areas are quite a bit larger.”