Excludability

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Excludability is defined in economics as whether or not it is possible to exclude people who have not paid for a good or service from consuming it. Where it is impossible to prevent an individual who does not pay for that thing from enjoying the benefits of it, the good is termed non-excludable.

A well-architected building, such as the Eiffel Tower, creates an aesthetic non-excludable good, which can be enjoyed by anyone who happens to look at it. It is difficult to prevent people from gaining this benefit (although people have tried, by forbidding amateurs from taking photographs of certain sites [1])

A lighthouse acts as a navigation aid to ships at sea in a manner that is non-excludable.

An excludable good could be a magazine; people who do not pay for the subscription are mostly excluded from obtaining a copy directly from the publisher. Another case in point is a pay television subscription.

Excludability, World Bank. Last accessed 29 May 2007.

Types of goods

public good - private good - common good - common-pool resource - club good - anti-rival goods

rivalrous good and non-excludable good
complement good vs. substitute good
free good vs. scarce good, positional good

(non-)durable good - intermediate good (producer good) - final good - consumer good - capital good
inferior good - normal good - ordinary good - Giffen good - luxury good - Veblen good - superior good
search good - (post-)experience good - merit good - credence good - demerit good

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