Final answer:
An increase in capital per hour worked from $20,000 to $25,000 is expected to result in an increase in real GDP per hour worked that is less than $500, due to the economic principle of diminishing returns.
Step-by-step explanation:
The subject of the question is related to the economic concept of diminishing returns in the context of rising capital per hour worked and its effect on real GDP per hour worked. The scenario provided is an example of how increasing capital investment per worker leads to increased productivity, but with diminishing benefits as investment continues to rise. According to the principle of diminishing returns, the increase in real GDP per hour worked would be less than $500 when the capital per hour worked increases from $20,000 to $25,000.
Since an increase in capital from $15,000 to $20,000 led to an increase of $500 in real GDP per hour worked, under the law of diminishing returns, the next $5,000 increase will result in a smaller increment in GDP per hour worked. Therefore, if capital per hour worked increases from $20,000 to $25,000, we would expect the increase in real GDP per hour worked to be less than $500. This is because, as more capital is added, each additional unit of capital will tend to produce less additional output.