1.  Mainstream economic analysis widely accepts a market failure can occur for three main reasons: if the market is "monopolised" or a small group of businesses hold significant market power, if production of the good or service results in an externality, or if the good or service is a "public good".

2.  In my opinion, market failure can occur in occasions for these reasons: if the market is monopolies, a small group of businesses hold the significant market power, the product or the goods result in externalities.

3.  Mainstream economic analysis widely accepts a market failure can occur for three main reasons: if the market is "monopolized" or a small group of businesses hold significant market power, if production of the good or service results in an externality, or if the good or service is a "public good.

4.  Mainstream economic widely accepts that a market failure can occur for three main reasons: if the market is "monopolized" or a small group of businesses hold significant market power, if production of the good or service results in an externality, or if the good or service is a "public good.

5.  Mainstream economic analysis widely accepts a market failure can occur for three main reasons: if the market is "monopolized" or a small group of businesses hold significant market power, if production of the good or service results in an externality, or if the good or service is a "public good".

6.  Mainstream economic analysis widely accepts that a market failure can occur for three main reasons: if the market is "monopolised" or a small group of businesses hold significant market power, if production of the good or service results in an externality, or if the good or service is "public goods".

7.  Mainstream economic analysis widely accepts a market failure can occur for three main reasons: if the market is "monopolized" or a small group of businesses hold significant market power, if production of the good or service results in an externality, or if the good or service is a "public good".