The U.S. jobless rate was flat at 9.6% in September, but the government’s broader measure of unemployment rose even more to 17.1%, the highest rate since April and down just slightly from the October 2009 high of 17.4%. The comprehensive gauge of labor underutilization, known as the “U-6″ for its data classification by the Labor Department, accounts for people who have stopped looking for work or who can’t find full-time jobs. The key to the rise in the broader unemployment rate was due to a 612,000 jump in the number of people employed part time but who would prefer full-time...