For each statement draw a diagram illustrating the likely effect on the market for Greyhound bus tickets. Show the impact on the equilibrium price and quantity. If the event causes a shift in either supply or demand schedule indicate which variable caused the shift in supply or demand.

1- A Greyhound bus crashes and kills 50 passengers.

2- Greyhound bus company starts charging a fee for each piece of luggage.

3- The cost of gas rises.

4- The bus drivers receive an increase in their wage.