"If one of your local bankers were asked how much he allowed his bank to issue in cashier's checks, he would tell you that he issued whatever sums his customers wanted; either against their balances, or against new loans. He would tell you the same in respect of the amount of exchange he issued; his sole rule and guide being the amount of such credit which his customers require, and which he is in position to lend afresh, and to maintain against, or to redeem in cash, if demanded. If asked how long these obligations were allowed to remain outstanding, he would tell you that he had no control whatever over the period of their circulation; that these obligations stood out just as long as the holders wanted to use them in that form, and no longer; that his only concern was in being prepared to redeem the obligations on demand in cash.
"Thus it is that the volume of bank credits, whether in the form of deposits, checks or notes, responds in a rise or fall according as there is legitimate trade demand; and over this the bank has no control, except by ceasing to make loans. This is why deposits increase as loans increase, and these increase as the volume of business increases."
Now, if we understand the real nature of these so-called deposits, the reason for their diminution is plain. Deposits fall because loaning stops. When you stop loaning, you stop creating credit. You can readily see that it is not a diminution of deposits in cash, but it is a contraction of credit, a refusal to make loans.
This erroneous notion of the real meaning and nature of deposits in banking language may lead to very great mistakes in estimating the stability of a bank. That a bank's stability depends on a due proportion being kept between the deposits or the liabilities and the cash; and it may very well happen that while the deposits are apparently mounting high, and might lead many persons to believe that the actual quantity of cash was increased, it might be nothing, perhaps, but a dangerous extension of credit. And if this were carried too far, the bank might be in the most dangerous position just when it was apparently most flourishing.
Now, let us consider how a banker who has purchased either money or notes from his customers by creating deposits or debts, may be used by his depositors. That is how the depositors may use these credits. Of course, every banker does business exactly in the same way, or practically so, and when their customers begin to use checks these different results may follow: