Which of the following is not a factor of production(this is an economics class question)

a. the land required for a hog farm

b. the training required to repair an airplane engine

c. the teacher required to teach an economics class

d. the amount of money required to buy a car

Erikson's theory of personality grants more power to the than freud had allowed.

17 points! ! (explain your answer)

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?