A third-degree price discriminating monopolist can sell its output either in the local market or on an internet auction site (or both). After selling all of its output, the firm discovers that the marginal revenue earned in the local market was $20 while its marginal revenue on the internet auction site was $30. To maximize profits the firm should:

the firm should have sold less output in the local market, and more output on the internet auction site.

Explanation:

Based on the scenario being described within the question it can be said that in order to maximize profits the firm should have sold less output in the local market, and more output on the internet auction site. This is because marginal revenue indicates the additional revenue that will be generated by increasing product sales by one unit. Therefore since the internet auction site's marginal revenue is higher than the local store, it means that selling more units in the internet site will lead to more profit than the local market.

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