Answer:
Over
Externality
Market power
Step-by-step explanation:
Externality is a form of market failure where the activities of economic agents affect third parties not involved in production or consumption
Externality can be positive or negative
A good has negative externality if the costs to third parties not involved in production is greater than the benefits.
The costs of polluting the river by the firm is greater than the benefits. Thus, this causes negative externality
Taxation increases the cost of production and therefore discourages overproduction. Tax levied on externality is known as Pigouvian tax.
A firm has Market power when it can increase prices above the level that would exist that in a competitive market.
Firms that have market power are usually monopolies
A monopoly is when there is only one firm that exists in an industry