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Even newborns display habituation.Ellie is three days old and has begun to show less interest in her mother's shiny red glasses.
National Defense
Government-provided security against foreign aggression, encompassing the military forces and other defense measures.
Common Resource
A resource like air or water that is not owned by anyone, is available for everyone to use, but can become depleted if overused.
Excludable
A characteristic of a good for which it is possible to prevent individuals from enjoying its benefits unless they pay for it.
Artificially Scarce
A situation where a product or resource's availability is limited through artificial means rather than natural scarcity.
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