Final answer:
Improved technology is the key factor driving productivity growth in the U.S. labor market.
Explanation:
Improved technology is MOST LIKELY the main factor contributing to the growth in productivity in the U.S. in recent years. Technological advancements have increased the efficiency of labor, leading to higher productivity levels.
Additionally, as technology has advanced, it has positively impacted the availability of capital, other factors of production, and human capital, all of which play a crucial role in enhancing labor productivity.
This aligns with the historical trend where growth in productivity of labor has been linked to advancements in technology, ultimately leading to higher wages and employment opportunities.
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