West Coast Digital (WCD) manufactures top-notch audio and video gear, and one of their standout products is a personal video recorder (PVR) designed for high-definition digital television systems. The PVR has gained significant popularity over the last three years due to its attractive features, which allow users to effortlessly record live TV, simultaneously watch recorded content while recording another program, and store numerous programs for later viewing on its spacious internal hard drive.
Is Davis's general approach to calculating the opportunity cost in terms of the physical units involved, correct?