William B. Weeden, Popular Science Monthly (1875)
“ Now, as I understand supply and demand in the market, they are not dead-weights of matter, like a rock crushing my finger; they are forces like the gravitation controlling the rock, and which I must recognize if I would keep my finger whole and escape mental distress. These forces affect laborers and capitalists, producers and consumers alike, and they are the strongest influence in fixing market-prices. In fact, we may consider them the only forces present and active when the selling price is fixed. All other forces must have been transmuted before price can be fixed. ”
