When goods are produced privately, but the cost of their purchase is paid for by the taxpayer or some other third party, a. consumers have a strong incentive to search out those firms offering them the best deal. b. private producers of such goods will have little incentive to control costs and provide them at low prices. c. goods and services will only be supplied if consumers are willing to pay an amount sufficient to cover their production costs. d. the invisible hand will direct consumers and producers toward an efficient level of output.

b. private producers of such goods will have little incentive to control costs and provide them at low prices

Explanation:

Externality is a situation where the production activities of market participants (either producers or consumers) have an effect on third parties not involved in production.

Externality is a form of market inefficiency.

Negative externality is when goods are produced privately, but the cost of their purchase is paid for by the taxpayer or some other third party.

When negative externality occurs, producers have little incentive to reduce cost because they don't bear the total brunt of their activities. This is why activities that generate negative externality are over produced.

Government needs to step in to control this problem. They can either impose tax on producers or regulate their activities.

Pollution is an example of negative externality.

I hope my answer helps you

answer; encouraging the development of innovations by firms attempting to break a monopoly; (creative destruction)