Market failure occurs when the price mechanism fails to account for all of the costs and benefits necessary to provide and consume a good. The market will fail by not supplying the socially optimal amount of the good.
The main four market failures are:
- Positive and negative externalities: an externality is an effect on a third party that is caused by the consumption or production of a good or service.
- Environmental concerns: effects on the environment as important considerations as well as sustainable development.
- Lack of public goods: public goods are goods where the total cost of production does not increase with the number of consumers.
- Underproduction of merit goods.
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