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Question 18 Verizon, AT&T, Sprint and T-Mobile-control more than 90 percent of the US wireless service provider market. This is an example of which type of markets. a pure competition b.pure monopoly monopolistic competition d. oligopolistic competition e. antitrust agreements aestion 19 103 year old cardmaker American Crewing is reaching out to your home. The is called commerciation i market modifying marketing i modifying Od product modifying O test marketing