Louis F. Post,
The basic facts of economics
(1927)
“ Beneath that surface we first find Trade, for which Money is the medium or the means of expressing relative values and adjusting balances. Trade consists essentially in interchanges of commodities, inclusive of natural resources and of human service. It is not an arbitrary custom or set of customs, but a phenomenon of natural law through which artificial objects are produced to completion and final delivery. But Trade, though lying beneath the Money surface of Economics, is not a basic fact of that science. ”
