When determining what price to charge for a product or service, marketing executives consider which of the following?
competitors' pricing structures
how much customers can afford to pay for the product or service
at what point the market will be flooded with similar products and services, driving down consumer demand
all of the above

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?