Confidence in these conclusions is much increased by a study of the views of Professor Taussig.[180] Professor Taussig is, in his initial formulations of his doctrine, a quantity theorist. In a situation where only money is used, credit being excluded, in effecting exchanges, he would hold that the quantity theory correctly accounts for prices. He is fond of the old formulation, as a first approximation, even in dealing with the complex facts of modern banking. But he does not dodge the complex facts, and his theory becomes, substantially, first, a general formula, and second, an elaborate body of qualifications and exceptions, the latter making up the major part of the theory. His doctrine regarding the relation of money and credit is as follows: there is, in the long run, a real _limitation_ on elastic credit instruments in the quantity of _specie_. (This is very different from the assertion that there is a _fixed_ ratio between _deposits_ and _money_ in circulation, including paper, bank-notes, etc., in money. The present writer has no quarrel with the doctrine that the gold supply of the _world_ imposes _outside_ limitations on the _possible_ expansion of credit.) The limitation, Taussig holds, comes in two ways: (1), in the connection between prices in any one country, and prices in the world at large; (2), in various links of connection between the volume of deposits (and of notes elastic like deposits) and the quantity of specie. I shall consider at a later point the relation between prices in different countries.[181] I shall there maintain that the quantity theory, which explains gold movements on the basis of price-_levels_ in different countries, is inadequate; that not price-levels, but particular prices, of goods most available for international trade, are of primary importance, and that of these particular prices, one, namely the "price of money," or the short time money-rate, is most significant of all. For the present, I wish to analyze the linkages which Taussig finds between elastic credit instruments and specie, and to see how far they would go, not in proving Taussig's point (with which I have little quarrel) but in proving Fisher's contentions. The points involved are: (a) _Direct necessity_ constrains the bankers to keep _some_ cash on hand.[182] This fixes a _minimum limit_ (Taussig's contention), but does not at all suggest a "normal ratio" (Fisher's contention). (b) _Binding custom_, as to the proper amount of reserve that banks should carry, particularly important in connection with the Bank of England, but also in evidence in the Banque de France and the Reichsbank. Here again, however, minimal, rather than fixed, ratios are suggested. Limitations on the _expansion_ of credit these customs may impose, but they by no means determine a normal, or average amount of credit expansion--in England least of all, since there is so large a flexible element in the deposits