The present word is derived from the Latin VALERE, _to pass for, to be worth_. There is a strong hint of a _comparison_ in the original meaning of the word, and the current use of it both in Latin and English develops the hint into a certainty. In common language, when the Value of anything is asked for, the answer always comes in the terms of something else. If the question be, How much is it worth? the answer is, So many dollars or cents. Now the cents or dollars are very different things from those whose value is thus inquired after; and so we see again from another point of view that Value is a relative matter, since it clearly implies a comparison between two distinct things; and, if so, it is clearly enough not a quality of any one thing, and of course it would be useless to try to ascertain the Value of anything by a study of that thing alone. Etymology thus easily brings us up to our present vital question, and will assist us to solve it completely. (c) _What is Value?_ Plainly it is the result of a comparison instituted between two things, using the word, "things," here in its broadest sense. But who institutes the comparison? And who is competent to announce the result of it in Value? A comparison is required in order to ascertain the length of a stick of timber in feet and inches, and a carpenter's square is the instrument by which the comparison is made, and it makes no difference in the result whose the square is or whose the stick of timber is, since the square and the stick have in common the physical quality of length, and a simple comparison of square with stick determines the length of the latter, and one man in this case may determine the result by himself alone, and it is not needful that he be the _owner_ of either of the things compared. But it is a different kind of comparison from this that issues in Value. Let us suppose an exchange of a bushel of wheat for a mason's trowel: there is no common physical quality, as length, between the wheat and the trowel; and it is evident, that no _one_ man can measure in any form one of these two commodities by means of the other. It is a peculiar kind of comparison that is involved in any and every trade; and the first peculiarity of it is, as we have already seen in another connection, that it always requires "two persons" to make it; and each of the two persons must always be the virtual _owner_ of one of the two things exchanged. A thief may indeed go through the motions of selling a stolen horse, but as he is not the owner of the horse there can be no sale, and the actual owner may take his horse wherever he finds it even in the hands of an innocent third party. In other words, there must ever be "two efforts" also, two legitimate efforts giving a valid claim of ownership to each of the two parties in the exchange.