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https://twitter.com/daringabroad By way of contrast, there are many useful goods and services which do not have these characteristics. They are generally produced in large, r ‘lumpy’ units. Further, the benefits are not exclusive to a few individuals. That is, use of these goods by one person does not exclude their use by others. Examples are a public or national park, national defense, and such items as research on agriculture, disease prevention and control and environmental protection. These items must be provided in some standard and services are not exclusive. Your use and enjoyment of the national park or your enjoyment of the clean environment, does not preclude similar use by your friends and neighbors’.