Nobel Prize-winning economist Joseph Stiglitz says the US has failed to fix the underlying problems of its banking system after the credit crunch and the collapse of Lehman Brothers.

“In the US and many other countries, the too-big-to-fail banks have become even bigger,” Stiglitz said in an interview overnight in Paris. “The problems are worse than they were in 2007 before the crisis.”

Stiglitz’s views echo those of former Federal Reserve chairman Paul Volcker, who has advised President Barack Obama’s administration to curtail the size of banks, and Bank of Israel Governor Stanley Fischer, who suggested last month that governments may want to discourage financial institutions from growing “excessively.”

A year after the demise of Lehman forced the Treasury Department to spend billions to shore up the financial system, Bank of America’s assets have grown and Citigroup remains intact.

In the UK, Lloyds Banking Group, 43 per cent owned by the government, has taken over the activities of HBOS, and in France BNP Paribas now owns the Belgian and Luxembourg banking assets of insurer Fortis.

While Obama wants to name some banks as “systemically important” and subject them to stricter oversight, his plan wouldn’t force them to shrink or simplify their structure.

Stiglitz said the US government is wary of challenging the financial industry because it is politically difficult, and that he hopes the Group of 20 leaders will cajole the US into tougher action.

G-20 steps

“We aren’t doing anything significant so far, and the banks are pushing back,” he said. “The leaders of the G-20 will make some small steps forward, given the power of the banks” and “any step forward is a move in the right direction.”

G-20 leaders gather next week in Pittsburgh and will consider ways of improving regulation of financial markets and in particular how to set tighter limits on remuneration for market operators.

Under pressure from France and Germany, G-20 finance ministers last week reached a preliminary accord that included proposals to claw-back cash awards and linking compensation more closely to long-term performance.

“It’s an outrage,” especially “in the US where we poured so much money into the banks,” Stiglitz said. “The administration seems very reluctant to do what is necessary. Yes they’ll do something, the question is: Will they do as much as required?”

Global economy

Stiglitz, former chief economist at the World Bank and member of the White House Council of Economic Advisers, said the world economy is “far from being out of the woods” even if it has pulled back from the precipice it teetered on after the collapse of Lehman.

“We’re going into an extended period of weak economy, of economic malaise,” Stiglitz said. The US will “grow but not enough to offset the increase in the population,” he said, adding that “if workers do not have income, it’s very hard to see how the US will generate the demand that the world economy needs.”

The Federal Reserve faces a “quandary” in ending its monetary stimulus programs because doing so may drive up the cost of borrowing for the US government, he said.

“The question then is who is going to finance the US government,” Stiglitz said.

Bloomberg