Sentence:  If the takeover is approved, Comcast would control 20 of the top 25 cable <WSD>markets</WSD>, […]. Antitrust officials will need to consider Comcast's status as a monopsony (a buyer with disproportionate power), when it comes to negotiations with programmers, whose channels it pays to carry. 
Meaning of the word marked with <WSD> tags:  A formally organized, sometimes monopolistic, system of trading in specified goods or effects.