The U.S. economy grew at a 3.8% seasonally adjusted annual rate in the third quarter of 2005, the Commerce Department estimated Friday. Consumer spending contributed most to the growth rate. The trade sector was a slight drag. Economists surveyed by MarketWatch were expecting GDP to increase 3.6% in the third quarter after 3.3% in the second quarter. Core consumer prices increased as a 1.3% rate in the third quarter, down from a 1.7% rate in the second quarter, leaving the year-over-year increase at 1.9%. The government did not provide an estimate for the impact on growth from Hurricanes Katrina and Rita.