In analyzing a market, the time horizon where technology can change and firms can offer new products is referred to as the Select one: 13 a. short run. 13 b. very short run. 0 0. long run. C d. very long run. Which of the following is not an example of a market imperfection that might explain persistent wage differentials within an occupation? Select one: a geographic immobility of workers Cl b. discrimination O c. noncompeting groups C d. poor information about job opportunities and pay