Examlex
A research assistant does not know whether she is administering a placebo or an anti-anxiety pill to a given participant; she is therefore assisting in a single-blind study.
Socially Optimal
Refers to a situation where goods or services are produced and consumed at a level that maximizes overall social welfare.
Pollution
The contamination of the environment with harmful or poisonous substances, adversely affecting the health of living organisms and ecosystems.
External Costs
Costs of an economic activity that are not borne by the participants but rather by other people or society at large.
Tax
A compulsory financial charge imposed by a government on individuals or entities to fund various public expenditures.
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