The following equations describe the behaviour exhibited by buyers and sellers for a particular product in a specific country: Q = 200 -0.4Pt-1 Q = -40+0.8P Note that Q denotes the quantity demanded, Q is the quantity supplied and P, is price. (a) At the market equilibrium, find the difference equation for price (P.). (4 marks) (b) Find the unique solution for P, the long run equilibrium price and quantity, given that Po=$250. (7 marks) (c) Discuss the movement and stability of equilibrium price in the long run. (4 marks)