A cell phone manufacturer is producing 500,000 phones and sells them for $1,800 each. At this level of output, marginal revenue is $800. From this information, would you conclude that the cell phone manufacturer is a competitive firm or a monopolist? Why? The cell phone manufacturer is a competitive firm because cell phones are homogenous goods. The cell phone manufacturer is a monopolist because price is greater than marginal revenue. The cell phone manufacturer is a monopolist because 2.1 million phones is a sufficiently large quantity that it likely dominates the market for cell phones. The cell phone manufacturer is a competitive firm because price is equal to marginal revenue