Why are services becoming a larger and larger part of the U. S. economy?

Answer/Explanation:

A sector of the economy becoming less concerned about material needs. In the consumer sector, this leads to increasing demand for services such as health, education, and entertainment. Services such as public education, health care, well- maintained roads, safe drinking water, clean air, and public safety are necessary for any nation's economy to survive and people to prosper.

explanation:

it was dumb and stupid town

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.