A service is basically a transaction where no tangible goods are exchanged from the seller directly to the buyer. The advantages of such a service would be proven by the willingness of the buyer to make the trade without any condition. Such public services are usually those that are publicly funded by society. Examples of public services that make use of this theory are hospitals and universities. While a service may be a very valuable commodity in its own right, the manner in which it is exchanged between buyer and seller goes a long way in determining its value.