abc communications developed a new type of smartphone that has a three-dimensional (3-d) screen. the company holds a patent on this technology, so they are the only seller of the 3-d phone when it is introduced. over time, other companies introduce phones that are similar but not identical (i.e., they do not violate the patent held by abc). what happens to the demand for 3-d phones facing abc and to the profit-maximizing price for the 3-d phone as these similar products enter the market?