Public good
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In economics, a public good is a commodity, product or service that is both non-excludable and non-rivalrous and which is typically provided by a government and paid for through taxation. Use by one p
Aids to navigation such as lighthouses are often used as an example of a public good, as they benefit all maritime users, but no one can be excluded from using them.
Yosemite National Park, an example of an environmental good.
Stowaway passengers who avoid payment turnstiles are "free-riding" on the train.
A transit service provides benefits for a wide range of people.
Rivalry (economics)
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In economics, a good is said to be rivalrous or a rival if its consumption by one consumer prevents simultaneous consumption by other consumers, or if consumption by one party reduces the ability of a
Public good
…In economics, a public good (also referred to as a social good or collective good) is a commodity, product or service that is both non-excludable and non-rivalrous and which is typically provided by a government and paid for through taxation. Use by one person neither prevents access by other people, nor does it…
Wild fish stocks are a rivalrous good, as the amount of fish caught by one boat reduces the number of fish available to be caught by others.