The market price of cheeseburgers in a university town decreased recently, and the students in an economics class are debating the cause of the price decrease. Some students suggest that the price decreased because a new type of grill allows restaurants to cook a cheeseburger in half the time. Other students attribute the decrease in the price of cheeseburgers to a recent decrease in the price of calzones at local pizza parlours. Everyone agrees that the decrease in the price of calzones was caused by a recent decrease in the price of pizza dough, which is not generally used in making cheeseburgers. Assume that burger joints and pizza parlours are entirely separate entitiesthat is, there aren't places that serve both cheeseburgers and calzones. How to plot in supply and demand graph?

The first group of students thinks the decrease in the price of cheeseburgers is due to the fact that a new type of grill allows restaurants to cook a cheeseburger in half the time?

The second group of students attributes the decrease in the price of cheeseburgers to the decrease in the price of calzones at local pizza parlours?

Suppose that both of the causes suggested by the students are partly responsible for the decrease 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 is the dominant cause of the decrease in the price of cheeseburgers?

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

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

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

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