more constant ratio[324] of loans and discounts to deposits. That this close relation between deposits and loans should obtain follows naturally from the theory of elastic bank-credit. The two are built up together. When there are expanding business and rising prices, men borrow more from the banks; as they borrow, they receive deposit credits; the individual who receives the deposit credit may check against it, but it is redeposited by another man, and so, while the deposits of one bank need not grow out of its loans, still, for banks in general, deposits are large because loans are large. For a given bank, the relation holds closely, because the bank lends, in general, to active business men, who will have income as well as outgo, and whose income will, on the average, at least balance their outgo. Thus, _through loans_, deposits are linked with volume of trade and prices. Trade and deposits wax and wane together.[325] On the other hand, in the absence of rising prices and increasing trade, reserves may increase greatly without forcing an increase in deposits. Loans cannot increase without an increase in deposits. The linkage between deposits and trade is definite, causal, positive, statistically demonstrable. The linkage between reserves and deposits is, at most, negative--if reserves get too low, deposits and loans may be checked in their expansion. But this--to the extent that it is true, which we leave, for detailed analysis, for Part III--gives a very much looser relation indeed than the direct relation between loans and deposits. The quantity theory has offered no explanation of this relation between loans and deposits. What explanation could a theory offer, which rests in the notion that volume of trade on the one hand, and volume of money and bank-credit on the other hand, are independent magnitudes?[326] I do not mean that quantity _theorists_ are silent regarding the relation of loans and deposits. I mean that they do not attempt, in any discussion I have found, to apply the quantity _theory_ to the explanation of that relation. What shall we say of a theory which, ignoring these easily proved, easily explained, and vital facts regarding bank-credit, offers as its sole explanation of volume of bank-credit a theory so untenable as that of a fixed ratio between volume of bank-credit and volume of money _in circulation_, with causation running from money to deposits?