Arthur Latham Perry,
Principles of Political Economy
“ Market-value is the present rate of exchange between dollars and cents and any other valuable, that can be fairly graded in a class made up of valuables similar to itself; and the law of market-value is the equation of Supply and Demand, that is, the current rate is adjusted when money enough is offered to take off within the usual times the valuables on hand and offered for sale. If Demand for any reason become quickened, and the Supply be not increased, there is competition among buyers for the stock in market, and the market-rate rises or tends to rise. ”
