In recent years, the primary economic concerns have centered on : high household debt ( $ 11 trillion, including $ 2.5 trillion in revolving debt ), high net national debt ( $ 9 trillion ), high corporate debt ( $ 9 trillion ), high mortgage debt ( over $ 15 trillion as of 2005 year-end ), high external debt ( amount owed to foreign lenders ), high trade deficits, a serious deterioration in the United States net international investment position ( NIIP ) ( " 24 % of GDP ), and high unemployment.