Nouriel Roubini : The U.S. will experience its most severe recession since WWII

The recession will continue until at least the end of 2009 for a cumulative GDP drop of over 4%; the unemployment rate will likely reach 9%

Obama will inherit and economic and financial mess worse than anything the U.S. has faced in decades: the most severe recession in 50 years; the worst financial and banking crisis since the Great Depression; a ballooning fiscal deficit that may be as high as a trillion dollar in 2009 and 2010; a huge current account deficit; a financial system that is in a severe crisis and where deleveraging is still occurring at a very rapid pace, thus causing a worsening of the credit crunch; a household sector where millions of households are insolvent, into negative equity territory and on the verge of losing their homes; a serious risk of deflation as the slack in goods, labor and commodity markets becomes deeper; the risk that we will end in a deflationary liquidity trap as the Fed is fast approaching the zero-bound constraint for the Fed Funds rate; the risk of a severe debt deflation as the real value of nominal liabilities will rise given price deflation while the value of financial assets is still plunging.
The world economy will experience a severe recession: output will sharply contract in the Eurozone, UK and the rest of Europe, in Canada, Japan, and Australia/New Zealand; there is also a risk of a hard landing in emerging market economies. Expect global growth – at market prices – to be close to zero in Q3 and negative by Q4. Leaving aside the effects of the fiscal stimulus China could face a hard landing growth rate of 6% in 2009. The global recession will continue through most of 2009.
The advanced economies will face stag-deflation (stagnation/recession and deflation) rather than stagflation as slack in goods markets, slack in labor markets and slack in commodity markets will lead advanced economies inflation rates to become below 1% by 2009.