The following events occur one at a time in the market for cell phones:
-The price of a cell phone falls
-Everyone believes that the price of a cell phone will fall next month
-The price of a call made from a cell phone falls
-The price of a call made from a land-line phone increases
-The introduction of camera phones makes cell phones more popular
Explain the effect of each event on the demand for cell phones.
Does any event illustrate the law of demand?