Economists project that U.S. worker productivity fell in the April-June period for the second consecutive quarter. The Labor Department is expected to report Tuesday that nonfarm labor productivity fell in the second quarter at an annual rate of 4.1%. That would follow a 7.3% decline in the first three months of the year. Productivity is the amount of output per hour of work. The economy shrank in the first half of this year, raising fears that the nation may be in a recession.