_Essentials of value._--Experience seems, therefore, to settle upon three conditions for value in any article of wealth or any service rendered. First, the article or service must have utility--that is, it must be useful in satisfying somebody's wants, either present or future. Second, those wants must be of such a nature that effort on the part of some human being will be necessary to gratify them. Nothing which can be had at all times by mere desire of it can have value. Third, the object must be of such a nature as to command other services or exchange of other wealth. For this reason it must be transferable from one owner to another.
_Utility as related to value._--While utility is a basis of all values, it is not the chief element in measuring the value of wealth. The things of highest utility, like air and water, have no value as long as trifling exertion will bring them. Even land is without appreciable value so long as any person can obtain it by settling upon it.
In general, we measure utility by the relation between the nature of any object and human nature as expressed in wants. A bushel of wheat has utility equal to the number of loaves of bread it will furnish to hungry humanity. In this respect every bushel may have the same utility as every other. This would be true if every bushel of wheat was wanted by hungry people able to exert themselves in securing it; but if five bushels of wheat are sufficient for each human being in a year's supply of bread, a distribution to all the world of more than five bushels to each would make some of the wheat useless. So if the world's product of wheat more than supplies the world's want, the extra amount will be without utility unless some means of storing against future want is devised. In that case the utility of the stored portion will be lessened by the extra exertion required to store it until the need comes. One may be glad to pay twenty-five cents for a good dinner, but an equally good dinner offered immediately afterwards will have no utility, unless he can save it for supper. If the dinners offered are so many as to imply that several will be useless, the value of each is likely to be affected by this estimate of lost utility in some. Dinners in that case are liable to be furnished for what they are worth for cold suppers.