The widget industry is perfectly competitive. The industry demand and supply functions for widgets are given below.
Qd = 424 - 40P
Qs  = 40 +   8P
a.  What is the equilibrium price and quantity for the industry?
b.  If the government establishes a price floor of $9, explain what will result in terms of excess demand or supply.
c.  If the government establishes a price ceiling of $6, explain what will result in terms of excess demand or supply.