Examlex
If a star's measured parallax is 0.2 arcsec,what is its distance?
Free-Riding
The practice of benefitting from a good or service without paying for it or contributing to its provision, often discussed in the context of public goods.
Public Good
A product or service that is non-excludable and non-rivalrous, meaning its consumption by one individual does not reduce its availability to others.
Collective Willingness
The aggregated preference or desire of a group of individuals to support or buy into a particular idea, policy, or product.
Marginal Cost
The boost in complete costs associated with creating one more unit of a product or service.
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