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What's the ranking formula?

Service

In economics, a service is an intangible commodity. That is, services are an example of intangible economic goods. Service provision is often an economic activity where the buyer does not generally, except by exclusive contract, obtain exclusive ownership of the thing purchased. The benefits of such a service, if priced, are held to be self-evident in the buyer's willingness to pay for it. Public services are those, that society as a whole pays for, through taxes and other me...

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