Final answer:
The spike in US labor productivity in the 3rd Quarter of 2009 can be attributed to businesses laying off unproductive people during the recession, resulting in a more productive workforce.
Step-by-step explanation:
The big spike in US labor productivity in the 3rd Quarter of 2009 can be attributed to option b: businesses using the recession as an excuse to lay off unproductive people, resulting in a more productive workforce. The 2009 surge can be explained by companies optimizing their labor force through layoffs during the recession, thereby keeping only the most productive employees (option b). Additionally, the fear of job losses may have led employees to work harder and be less inclined to complain (option c), contributing to an unprecedented increase in productivity.
During a recession, businesses often make strategic decisions to cut costs and improve efficiency. In this case, laying off unproductive employees can lead to a more productive workforce. The remaining employees may be more motivated to work harder and perform better, as they are fearful of losing their jobs. Additionally, with a smaller workforce, businesses may focus on streamlining processes and implementing technology to increase productivity.
It's important to note that the spike in productivity during the recession may not be sustainable in the long term. As the economy recovers and businesses hire more employees, productivity growth may return to its normal rate.