On average, San Diego County households lost $2,337 in purchasing power from 2010 to 2011, according to the Center on Policy Initiatives (CPI). The CPI culled the data from U.S. Census Bureau figures released today (Sept. 20). Median earnings of people employed in 10 of 15 county industries declined from 2007 levels, says CPI. More than one-third of county households suffered economic hardship in 2011, with half of them in outright poverty, according to CPI. Black and Latino families and women bear the brunt of poverty and low incomes. Of the 462,269 people living below the federal poverty line, 117,408 were employed and 137,084 were children, says CPI.