You visit the local convenience store looking for a refreshing drink on a pleasant day. you know that you want a new type of cola beverage you've heard advertised on the radio, and reach into the refrigerator for what you think is the caffeine-free version of that cola. after you pay, pop the can, and begin drinking, you find that you purchased the sugar-free version instead ( what most likely contributed to this error?

Google started as one of many internet search engines, amazon started as an online book seller, and ebay began as a site where people could sell used personal items in auctions. these firms have grown to be so large and dominant that they are facing antitrust scrutiny from competition regulators in the us and elsewhere. did these online giants grow by fairly beating competition, or did they use unfair advantages? are there any clouds on the horizon for these firms -- could they face diseconomies of scale or diseconomies of scope as they continue to grow? if so, what factors may limit their continued growth?