What counts in Economic measurements is Money denominations--Money language rather than Money pieces. For in the world-wide processes of trade, only a slight proportion of either metal coin or paper currency passes from hand to hand. Nearly all Money measurements are entered in books of account; and in these the debits and the credits so nearly offset one another, by and large, that the difference as a whole is too slight for consideration in passing down from the Money surface of Economics to the basic facts. A common and impressive exemplification is afforded by clearinghouse statistics. These show that the enormous banking transactions in Money terms which merge at the clearings daily, are balanced off with a trifling percentage of tangible Money. Let the fact be emphasized then, that in defining Money as the medium of trade, Money terms rather than Money forms are to be understood as the trading medium. When a customer at a retail store buys a supply of groceries, his payment may be made in Money pieces, either metal or paper. Yet it may be made instead with a check drawn against his bank balance, or through a charge to his account in the retailer’s books. If paid in Money pieces, either at the time of purchase or later, some if not all of those pieces will go to the storekeeper’s bank and be credited to him in Money terms on the books of the bank. If the payment be made by check, the amount of the check will be entered in the storekeeper’s bank account as if it were a payment in Money pieces instead of Money terms. Be such transactions as they may, however,--cash payments or check payments or drafts or promissory notes--tangible Money plays on the whole but a small part. From purchases by customers at retail stores back to wholesalers; back of wholesalers to manufacturers of finished products and of unfinished products and of tools and of every other kind of merchantable object; back to land-owners for the sources of supply and the sites for production and delivery; back to farmers, to miners, to transportation agencies, to a vast though scattered army of wage-workers; through many a complicated series of accounts at stores, factories, mines, real-estate offices, railway and steamship offices, banks, clearinghouses--must we wend our way if we would investigate the processes of trade in detail. Yet only in slight degree do those processes involve the use of Money forms. Though coinage standards play their part, almost all trading transactions are made in Money terms and not with Money pieces.