Yale University economist John Geanakoplos said Thursday the failure of President Barack Obama's administration to stem the foreclosure crisis has stymied efforts to jump-start the economy.

"I think that's the biggest mistake of the Obama administration," Geanakoplos said, referring to the administration's failure to convince lenders to reduce the principal on underwater mortgages. "Writing down interest, as the government did, just produced a bunch of people who re-defaulted anyway."

Geanakoplos made his comments at a panel of economists at Yale Law School. He said reducing the principal on mortgages that exceed the value of homes would have made everyone better off by helping borrowers stay in their houses, helping lenders recoup as much money as possible, and helping housing prices recover.

But instead, he said, the Federal Reserve has been stuck with the burden of reviving the housing market when it does not have the power to oversee debt in the economy. As a result, he said, the Fed's stimulus measures have been ineffective: "The rich are getting richer. The Fed wants them richer so that they’ll spend a little more money. That’s trickle-down economics."

There have been roughly 8 million mortgage foreclosures since the housing crisis began, according to Geanakoplos.

Robert Shiller, a Yale economics professor, praised some ideas in the American Jobs Act, while including a backhanded criticism of Obama's economic advisers: "I think Obama has assembled a good team. Now, they're not inspired like [John Maynard] Keynes was to find a deep, major solution to this problem."

Republican politicians also received their share of criticism. Michael Woodford, an economics professor at Columbia University, bashed as "perverse" recent Republican proposals to audit the Federal Reserve, consider bringing back the gold standard, and force the Federal Reserve to focus only on price stability.

William Nordhaus, an economics professor at Yale, said he thinks it's possible that the U.S. will go over the "fiscal cliff," the combination of tax increases and spending cuts scheduled to take effect at the end of the year that may plunge the U.S. into recession. "I don’t think anybody wants to," he said. "But nobody wanted World War I, nobody wanted World War II, nobody wanted to spend 10 years in Iraq. But things happen."

Earlier on HuffPost:

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  • Myth: The Fed actually prints money.

    <a href="http://www.foxbusiness.com/industries/2012/08/17/chance-fed-printing-more-money-jumps-to-60/">People commonly say</a> that the Fed itself prints money. It's true that the Fed is in charge of the money supply. But technically, <a href="http://www.newyorkfed.org/aboutthefed/fedpoint/fed01.html">the Treasury Department prints money on the Fed's behalf</a>. Asking the Treasury Department to print cash isn't even necessary for the Fed <a href="http://www.huffingtonpost.com/2012/03/21/federal-reserve-profit-2011_n_1369354.html">to buy securities</a>.

  • Myth: The Federal Reserve is spending money wastefully.

    Both CNN anchor <a href="http://www.huffingtonpost.com/2012/08/31/cnn-erin-burnett-federal-reserve-stimulus_n_1848210.html" target="_hplink">Erin Burnett</a> and Republican vice presidential nominee <a href="http://thinkprogress.org/economy/2012/09/07/813011/paul-ryan-jobs-qe/" target="_hplink">Paul Ryan</a> have compared the Federal Reserve's quantitative easing to government spending. But <a href="http://www.huffingtonpost.com/2012/03/21/federal-reserve-profit-2011_n_1369354.html">the Federal Reserve actually has created new money</a> by expanding its balance sheet. <a href="http://www.huffingtonpost.com/2012/03/21/federal-reserve-profit-2011_n_1369354.html">The Fed earned a $77.4 billion profit</a> last year, most of which it gave to the U.S. government.

  • Myth: The Fed is causing hyperinflation.

    <a href="http://krugman.blogs.nytimes.com/2011/12/15/inflation-predictions/" target="_hplink">Some</a> <a href="http://www.businessinsider.com/niall-ferguson-has-been-wrong-on-economics-2012-8" target="_hplink">conservatives</a> <a href="http://www.businessinsider.com/ron-paul-is-putting-on-a-great-show-right-now-in-front-of-bernanke-2012-2">have claimed</a> that the Federal Reserve is causing hyperinflation. But inflation is actually at <a href="http://www.nytimes.com/2011/09/18/sunday-review/the-facts-on-the-fed.html" target="_hplink">historically low levels</a>, and there is no sign that is going to change. <a href="http://www.bls.gov/news.release/cpi.nr0.htm" target="_hplink">Core prices have risen</a> just 1.4 percent over the past year, according to the Labor Department -- below the Federal Reserve's <a href="http://www.federalreserve.gov/newsevents/speech/bernanke20120831a.htm" target="_hplink">target of 2 percent</a>.

  • Myth: The amount of cash available has grown tremendously.

    <a href="http://www.nytimes.com/2011/02/10/business/economy/10fed.html?_r=1">Some Federal Reserve critics claim</a> that the Fed has devalued the U.S. dollar through a massive expansion of the amount of currency in circulation. But not only is inflation low; <a href="http://www.businessinsider.com/the-animated-gif-of-boy-throwing-money-out-of-the-window-is-not-a-metaphor-for-qe-2012-9">currency growth also has not really changed</a> since the Fed started its stimulus measures, as noted by Business Insider's Joe Weisenthal.

  • Myth: The gold standard would make prices more stable.

    <a href="http://www.businessinsider.com/ron-paul-is-putting-on-a-great-show-right-now-in-front-of-bernanke-2012-2">Rep. Ron Paul (R-Tex.) has claimed</a> that bringing back the gold standard would make prices more stable. But prices actually were much less stable under the gold standard than they are today, as <a href="http://www.theatlantic.com/business/archive/2012/08/why-the-gold-standard-is-the-worlds-worst-economic-idea-in-2-charts/261552/"><em>The Atlantic's</em> Matthew O'Brien</a> and <a href="http://www.businessinsider.com/why-conservatives-like-the-gold-standard-2012-8">Business Insider's Joe Weisenthal</a> have noted.

  • Myth: The Fed is causing food and gas prices to rise.

    <a href="http://www.huffingtonpost.com/2012/09/08/erin-burnett-federal-reserve_n_1866971.html">CNN anchor Erin Burnett claimed in September</a> that the Federal Reserve's stimulus measures have caused food and gas prices to rise. But many economists believe global supply and demand issues are influencing these prices, not Fed policy. And <a href="http://www.huffingtonpost.com/2012/09/08/erin-burnett-federal-reserve_n_1866971.html">there actually is no correlation between the Fed's stimulus measures and commodity prices</a>, according to some economists Paul Krugman and Dean Baker.

  • Myth: Quantitative easing has not helped job growth.

    <a href="http://www.forbes.com/sites/michaelpento/2012/05/01/why-higher-inflation-destroys-jobs/">Some Federal Reserve critics</a> claim that the Fed's stimulus measures have destroyed jobs. But <a href="http://www.federalreserve.gov/newsevents/speech/bernanke20120831a.htm">the Fed's quantitative easing measures actually have saved or created more than 2 million jobs</a>, according to the Fed's economists. In addition, JPMorgan Chase chief economist Michael Feroli told Bloomberg last month that <a href="http://www.bloomberg.com/news/2012-09-10/bernanke-proves-like-no-other-fed-chairman-on-joblessness.html" target="_hplink">QE3 will provide at least a small benefit</a> to the economy.

  • Myth: Tying the U.S. dollar to commodities would solve everything.

    <a href="http://articles.nydailynews.com/2012-08-16/news/33236684_1_monetary-policy-inflation-currency-debasement">Rep. Paul Ryan (R-Wis.) has proposed</a> tying the value of the U.S. dollar to a basket of commodities, in an aim to promote price stability. But <a href="http://www.theatlantic.com/business/archive/2012/08/forget-paul-ryans-budget-his-scariest-idea-is-about-the-federal-reserve/261066/">this actually would cause prices to be much less stable</a> and hurt the U.S. economy overall, as <em>The Atlantic's</em> Matthew O'Brien has noted.

  • Myth: Ending the Fed would make the financial system more stable.

    <a href="http://www.amazon.com/End-Fed-Ron-Paul/dp/B004IEA4DM">Rep. Ron Paul (R-Tex.) claims</a> that ending the Federal Reserve and returning to the gold standard would make the U.S. financial system more stable. But <a href="http://www.bloomberg.com/video/should-the-u-s-return-to-the-gold-standard-wsDVrOKATTqyTaG5yBY1kQ.html">the U.S. economy actually experienced longer and more frequent financial crises and recessions</a> during the 19th century, when the U.S. was using the gold standard and did not have the Fed.

  • Myth: The Fed can't do anything else to help job growth.

    <a href="http://www.nytimes.com/2011/07/31/business/economy/whats-with-all-the-bernanke-bashing.html">Many</a> <a href="http://www.guardian.co.uk/business/economics-blog/2012/jun/27/federal-reserve-runs-out-of-options">commentators</a> have claimed that there simply aren't any tools left in the Fed's toolkit to be able to help job growth. But <a href="http://www.bloomberg.com/news/2012-07-09/fed-harms-itself-by-missing-goals-stevenson-and-wolfers.html">some economists</a> <a href="http://www.boston.com/bostonglobe/ideas/articles/2011/08/28/the_i_word/">have noted</a> that the Fed could target a higher inflation rate to stimulate job growth. <a href="http://economix.blogs.nytimes.com/2012/04/25/bernanke-on-what-the-fed-can-do/">The Fed, however, has ruled this option out</a> -- for now.

  • Myth: The Fed can't easily unwind all of this stimulus.

    <a href="http://www.salon.com/2012/09/01/ben_bernanke_speaks//">Some commentators</a> <a href="http://seekingalpha.com/article/161203-fed-unwinding-won-t-be-easy">have claimed</a> that the Fed can't safely unwind its quantitative easing measures. But the Fed's program involves buying some of the most heavily traded and owned securities in the world, Treasury and government-backed mortgage bonds. The Fed will likely have little problem finding buyers for these securities, all of which will eventually expire even if the Fed does nothing. But <a href="http://economistsview.typepad.com/timduy/2012/09/plosser-opposes-the-1933-37-expansion.html">economists have noted</a> that once the Fed decides it's time to unwind the stimulus, the economy will have improved to such an extent that this won't be an issue.