Suppose that both of the events you have just analyzed are partly responsible for the increase in the price of cheeseburgers. Based on your analysis of the explanations offered by the two groups of students, how would you figure out which of the possible causes was the dominant cause of the increase in the price of cheeseburgers?

If the equilibrium quantity of cheeseburgers decreases, then the demand shift in the market for cheeseburgers must have been larger than the supply shift.

If the equilibrium quantity of cheeseburgers decreases, then the supply shift in the market for cheeseburgers must have been larger than the demand shift.

If the price increase was small, then the supply shift in the market for cheeseburgers must have been larger than the demand shift.

Whichever change occurred first must have been the primary cause of the change in the price of cheeseburgers.