Suppose the demand for Digital Video Recorders (DVRs) is given by Q=250 - .25P +4Pc, where Q is the quantity of DVRs demanded (in 1000s), P is the price of a DVR, and Pc is the price of cable television. How much does Q change if the price of cable changes slightly (i. e. the partial derivative of demand with respect to Pc?

Fortress international, a large conglomerate, procures a few component parts from external suppliers and also manufactures some of the key raw materials in its own subsidiaries. aside from this, the company does not solely depend on outside distributors to reach its customers. in fact, it has its own retail stores to distribute its products. in this scenario, which of the following alternatives to vertical integration is fortress international applying? a. concentric integration b. taper integration c. horizontal integration d. conglomerate integration