The equilibrium price at which a perfectly competitive firm sells its good is $8. The profit-maximizing quantity of output is 200 units. At this quantity of output, the firm has an average fixed cost of $4 and an average variable cost of $5. In the short run, this perfectly competitive firm should

When cell phones were first entering the market, they were relatively large and reception was undependable. all cell phones were essentially the same. but as the technology developed, many competitors entered, introducing features unique to their phones. today, cell phones are only a small fraction of the size and weight of their predecessors. consumers can buy cell phones with color screens, cameras, internet access, daily planners, or voice activation (and any combination of these features). the history of the cell phone demonstrates what marketing trend?