If a firm increases an input ( a factor of production) and thus reaps a 50-unit increase in output, we might call this extra-fifty:
et answered

answer; symbolic interactionism;

the answer is:

a. a closed question always has yes or no​ answers, whereas an open question is a​ free-response question.

it might look like that the ideal way to research the health effects of trans fats is through a controlled experimental feeding trial. but these kinds of trial have several important limitations that the researcher must look into:

short in duration (this factor usually checks up on the intermediary risk factors rather than the actual outcomes of the disease)

limited dietary changes

only makes use of healthy participants