The following events occur one at a time in the market for cell phones:

1.the price of a cell phone falls

2.everyone believes that the price of a cell phone will fall next month

3.the price of a call made from a cells phone falls

4.the price of a call made from a landline phone increases

5.the introduction of camera phones makes cell phones more popular

use diagrams to illustrate the effects of each event on the demand for cell phones