Question: What is the effect of each of the following events on the equilibrium price and quantity of hamburgers?

a. The price of steak ( a substitute for hamburgers) increases.

b. The price of French fries (a complement) increases.

c. The population becomes older.

d. The government requires that all the ingredients of hamburgers be absolutely fresh ( that is, nothing can be frozen).

e. Beef becomes more expensive.

f. More firms enter the hamburger business.