The U.S. increased the ratio of public and private debt from 152% GDP in 1980 to peak at 296% GDP in 2008, before falling to 279% GDP by Q2 2011. The 2009-2011 decline was due to foreclosures and increased rates of household saving. There were significant declines in debt to GDP in each sector except the government, which ran large deficits to offset deleveraging or debt reduction in other sectors.
As of 2009, there was $50.7 trillion of debt owed by US households, businesses, and governments, representing more than 3.5 times the annual gross domestic product of the United States. As of the first quarter of 2010, domestic financial assets totaled $131 trillion and domestic financial liabilities $106 trillion. Tangible assets in 2008 (such as real estate and equipment) for selected sectors totaled an additional $56.3 trillion.
Economist Martin Wolf explained in July 2012 that government fiscal balance is one of three major financial sectoral balances in the U.S. economy, the others being the foreign financial sector and the private financial sector. The sum of the surpluses or deficits across these three sectors must be zero by definition. In the U.S., a foreign financial surplus (or capital surplus) exists because capital is imported (net) to fund the trade deficit. Further, there is a private sector financial surplus due to household savings exceeding business investment. By definition, there must therefore exist a government budget deficit so all three net to zero. The government sector includes federal, state and local. For example, the government budget deficit in 2011 was approximately 10% GDP (8.6% GDP of which was federal), offsetting a capital surplus of 4% GDP and a private sector surplus of 6% GDP.
Wolf argued that the sudden shift in the private sector from deficit to surplus forced the government balance into deficit, writing: "The financial balance of the private sector shifted towards surplus by the almost unbelievable cumulative total of 11.2 per cent of gross domestic product between the third quarter of 2007 and the second quarter of 2009, which was when the financial deficit of US government (federal and state) reached its peak...No fiscal policy changes explain the collapse into massive fiscal deficit between 2007 and 2009, because there was none of any importance. The collapse is explained by the massive shift of the private sector from financial deficit into surplus or, in other words, from boom to bust."
Economist Paul Krugman also explained in December 2011 the causes of the sizable shift from private deficit to surplus: "This huge move into surplus reflects the end of the housing bubble, a sharp rise in household saving, and a slump in business investment due to lack of customers."
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