AT&T, MCI, Verizon, and Sprint control approximately 80 percent of the $16 billion international long-distance telephone service market.These companies operate in a(n)

Name: AT&T, MCI, Verizon, and Sprint control approximately 80 percent of the $16 billion international long-distance telephone service market.These companies operate in a(n)
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The fact that four companies control 80% of the market indicates that there are few competitors, which is a characteristic of an oligopoly market structure.

AT&T, MCI, Verizon, and Sprint Control Approximately 80 Percent of the $16