Productivity is a major issue in this economy and has been for a number of years.

4th quarter GDP just came out at .7% . I think Q3 as it was 4%.
There may be an inability to measure productivity growth with accuracy. I have not seen a study or paper on the effect of the increasing service and information sector and the shrinking manufacturing sector on productivity. It only makes sense that as jobs change from manufacturing to services there is a significant increase in productivity and that measuring this change is difficult.