Consider the following events: a. The price of cell phones goes down by 25 percent during a sale. This event would cause a b. You get a 25 percent raise at your job. This event would cause a Which of the following statements is true? A change in something other than price will mean a movement along an existing demand curve. A change in price will mean a movement along an existing demand curve. A change in income will cause a movement along the demand curve. A change in price will cause a shift of the demand curve.