Dow industrials close at their highest ever level By Mark Cotton Last Update: 4:06 PM ET Oct 3, 2006 NEW YORK (MarketWatch) -- U.S. stocks ended higher Tuesday, with the Dow Jones Industrial Average closing at its highest level ever, after the price of oil slumped to a 14-month low, raising hopes lower energy costs will boost consumer spending and moderate any slowdown in the economy. The Dow Jones Industrial Average ($INDUDow Jones Industrial Average News , chart, profile, more Delayed quote dataAdd to portfolio Analyst Create alertInsider Discuss Financials Sponsored by: $INDU ) rose 57 points to an unofficial...