Sales of new US single-family homes surged in August, but the boost from declining mortgage rates could be limited by a weakening labor market.New home sales shot up 20.5% to a seasonally adjusted annualized rate of 800,000 units last month, the Commerce Department’s Census Bureau said on Wednesday. The sales pace for July was revised higher to a rate of 664,000 units from the previously reported pace of 652,000 units.New home sales shot up 20.5% to a seasonally adjusted annualized rate of 800,000 units las ...