For years investors took comfort in the statement above.  Contemporary investors, including this one, took comfort on Tuesday when the automotive giant affirmed its third-quarter profit outlook and production for the year, four days after rival Ford Motor Co. lowered its earnings forecast.  That prediction shocked investors who had been reassured by stronger-than-expected first-half U.S. auto sales as the economy slowed.  GM’s confidence on Tuesday gave investors a glimmer of hope that the economy‘s trend might be improving.