Final answer:
The average U.S. worker's contribution to GDP was over $100 per hour in 2011, with significant increases in productivity noted since the 1970s, excluding government workers and farming.
Step-by-step explanation:
The average worker in the United States contributes a significant amount to the nation's Gross Domestic Product (GDP). In 2011, this amount was over $100 per hour, demonstrating a substantial increase from 1966 where the amount was roughly half of that value. It is important to note that this measure of productivity excludes government workers and farming.
Productivity has more than doubled since the early 1970s as seen in different productivity indexes with various base years, such as an index level of 50 in 1972 to approximately 106 in 2014, and an index level of 50 in 1977 to 110.5 in 2020, using 2009 and 2012 as base years, respectively.