If the price of textbooks rises and then students purchase fewer of them, then an economic model can show a cause-and-effect relationship only if which of the following conditions hold?

Question

Quizplus · Accepted Answer

The economic model can only establish a causal relationship between two variables if all other factors remain constant. In this case, the causal relationship between rising textbook prices and decreased student purchasing can only be identified if other factors, such as changes in student incomes or tuition costs or fluctuations in the number of students, are held constant. Only option D meets this requirement.

If the Price of Textbooks Rises and Then Students Purchase