A service is an economic activity where an immaterial exchange of value occurs. When a service such as labor is performed the buyer does not take exclusive ownership of that which is purchased, unless agreed upon by buyer and seller. 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 means. Services are intangible and insubstantial: they cannot be touched, gripped, handled, looked at, smelled, tasted. Thus, there is neither potential nor need for transport, storage or stocking of services.