Governments may intervene in a market economy in order to

The correct answer is letter "D": All of the above.

Explanation:

The government can intervene in a market economy due to several reasons: to protect creators when plagiarism has been reported (protection of copyrights), when the market has failed to manage to produce the level of output desired because of massive competition (correction of the market in front of externalities), or when job opportunities and benefits are not being distributed equally (distribution of income).

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