Final answer:
The concept that refers to the harm caused to a country when skilled workers emigrate is known as 'brain drain'.
This issue is exacerbated by U.S. policies that attract highly skilled professionals, particularly in STEM fields, through the H1B visa program.
Therefore, the correct answer is: option 'brain drain.
Step-by-step explanation:
Brain drain occurs when workers, especially those in the Science, Technology, Engineering, and Math (STEM) fields, leave their home country to pursue employment opportunities abroad.
As a result, the originating country loses skilled professionals which could otherwise contribute to its own economy and development. Countries like the United States benefit from immigration reforms, like those proposed by the Congressional Jordan Commission, that give priority to immigrants with high skill levels or those who are sponsored by U.S. employers for H1B visas.
This approach tends to alleviate some of the potential negative effects of lower-wage immigrant workers on the U.S. labor market but can exacerbate brain drain in the workers' home countries.