Katie considers the alternatives that will be lost if she decides to spend her savings on buying a car. what is the economic term for her thought process?

Opportunity Cost

Explanation:

Opportunity cost is a term used in economics to indicate the cost of something in terms of a given opportunity, that is, the cost, even social, caused by denying the so called "opportunity", as well as the benefits that could be obtained from of this renounced opportunity or, even, the highest income generated in some alternative application.

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.