Note to Ad Valorem from Unto This Last by John Ruskin

These statements sound crude in their brevity; but will be found of the utmost importance when they are developed. Thus, in the above instance, economists have never perceived that disposition to buy is a wholly moral element in demand: that is to say, when you give a man half-a-crown, it depends on his disposition whether he is rich or poor with it— whether he will buy disease, ruin, and hatred, or buy health, advancement, and domestic love. And thus the agreeableness or exchange value of every offered commodity depends on production, not merely of the commodity, but of buyers of it; therefore on the education of buyers, and or, all the moral elements by which their disposition to buy this, or that, is formed. I will illustrate and expand into final consequences every one of these definitions in its place: at present they can only be given with extremest brevity; for in order to put the subject at once in a connected form before the reader, I have thrown into one, the opening definitions of four chapters; namely, of that on Value ("Ad Valorem"); on Price ("Thirty Pieces"); on Production ("Demeter") and on Economy ("The Law of the House").