What is a trade-off?
a - decreasing the amount of resources spent on all wants to reduce the total costs in future
b - replacing one resource with another resource to satisfy a want
c - organizing the use of a resource in a manner that fulfills all wants
d - reducing the amount of resources spent on one want to spend more on another want

Its D. reducing the amount of resources spent on one want to spend more on another want  (100% correct; just took quiz and got all answers right)

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.

the boundarys like convergent divergent and transform it causes subduction