John Bates Clark,
Essentials of Economic Theory
“ In general, we must regard the opening of a profitable avenue for trade as we should the invention of a new machine, the discovery of a better electrical transmitter, or the utilizing of a cheaper motive power. It gives us more goods as the fruit of a given expenditure of labor and capital and affords a profit which, as we shall see, comes first to entrepreneurs and later to laborers and capitalists within the pale. ”
