Firms in the market will be price-takers when the following conditions are met:1. All firms in the market produce an identical product.2. A large number of firms (buyers and sellers) exist in the market, so that no single firm dominates the market.3. Each firm supplies only a very small portion of total output supplied to the market.4. No barriers limit entry into or exit from the market, and firms and resources are fully mobile.

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?