Suppose you are conducting a research study of the impact of Facebook's acquisition of Instagram in 2011 on the digital social network market. Your observation of the industry shows that Facebook controlled 90%90% of the social networking market after the merger.

Which of the following is true?

Just as in the market for non-network goods, the total number of firms, and not the distribution of market share, is the best indicator of inefficiency in the market for network goods.

Just as in the market for non-network goods, market share is the best indicator of inefficiency in this type of market.

Unlike the production of a traditional good by a monopoly, there are no potential antitrust concerns from the production of a network good. Production of network goods is always efficient.

Because Facebook is a network good, market share is less important in making a decision than the ability of other firms to contest the market.