1)Compare the difference between "Change in Supply"and" Change in Quantity Supplied". Discuss the causes and shape of curve.(2points).

2) At what price does Shortage and Surplus occur ? Once a market has shortage and Surplus, then what happens to the market price?(2 points)

3) If a decrease in Demandis smaller than a decrease in Supply, what happens to an equilibrium price and output sales?

4) if Coke price goes down, what happens to Pepsi demand? why?