A + B Theorm

This orthodox theory, then, assumes that the money, equivalent to the price of every article which is produced, is in the pocket, or the bank pigeon-hole of somebody in the world. In other words it assumes that the collective sum of the wages, salaries and dividends distributed in respect of the articles for sale at any given moment, which represent collective price, are available as purchasing-power at one and the same moment. Certain persons have more money in their pockets or bank pigeon-holes than they wish to spend on consumable goods. They do not spend it, they save it, as the phrase goes. By this abstinence from spending, they form a fund which enables capital goods, i.e. tools, plant, factories, to be paid for, and therefore produced, and because of the process by which these are paid for the capital goods thus produced become the property of those persons who have thus saved.

Now the first point to be grasped in regard to this argument as a whole is that, even supposing at any given moment it were true, one week afterwards it could no longer be true. If on a given day, there was extant in the world, sufficient money to buy all the goods in the world at the prices it had cost to produce those goods, and any portion of that money were applied to form the payment for the production of new goods, then that money so applied forms the costs of the new goods, and immediately there is a disparity between the total costs, which are the minimum total prices of goods, and the amount of money in the world which would ex-hypothesi, be exactly the same as before. This would be true even if no one "saved" any further quantity of money. The persons who had saved the money would not have saved the goods which the original money represented, they would merely have transferred their claims from the original goods in existence to new goods, and could only "get their money back" by the sale of those goods; nor would there be any mechanism in existence by which the old goods could be bought. That surely must be self-evident. [ 1 ]

[ 1 ] Social Credit, Part II: The Mechanism of the Classical Ideal, Chapter I, THE WORKING OF THE MONEY SYSTEM
http://www.douglassocialcredit.com/socialcredit/background.htm