Beginning in 2005, the housing market, which had been booming for years, turned. Housing construction dropped sharply in 2006. Go to www.bea.gov. Look at the GDP release and at past releases from 2005 to 015. In real dollars, how much private residential fixed investment (houses, apartments, condominiums, and cooperatives) took place in each quarter from 2005 to 2015? What portion of GDP did housing construction represent? After 2006, residential fixed investment was declining sharply, yet GDP was growing until the end of 2007. What categories of aggregate spending kept things moving between 2006 and the end of 2007?