The objections examined
4. A reasonable interpretation of the quantity theory makes it a statement of the effect of a change in a single factor. The objections to the quantity theory assume that it is a statement of what occurs under all conditions, instead of what it is, an index to the working of one condition at a time. The foregoing objections need but to be further analyzed to show that in each of them it is not merely the quantity of money, but a number of other factors that differ in each of the propositions. We may note briefly in turn the defects in the arguments of the preceding paragraph.
Not a per capita rule
First, the quantity theory does not remotely imply that prices in different countries differ at a given moment according to the per capita money. In the case of the United States and Mexico not only the amount of exchange per capita but the method of exchange, and the rapidity of the circulation of money differ quite as much, doubtless, as does the per capita circulation. The quantity theory would lead any fairly careful student to a conclusion the exact opposite of that which its critics have twisted from it.
Recognizes the growth of trade
Second, the quantity theory does not imply that during a period of years when a country is changing in a multitude of ways, as in population, methods of industry, modes of exchange and transportation, and in wealth and income, the prices will vary directly either as the absolute or per capita amount of money does. In the light of the quantity theory the inquirer must be led to just the opposite of the ridiculous conclusion imputed to it.
Recognizes use of credit
Third, the theory does not overlook the effect of an increased use of credit, for it fully implies that any such a change, by economizing the use of money, would enable the same amount of money to support a higher scale of prices.
Not confined to primary money
Fourth, the theory does not overlook the variety of forms, and is not true merely of primary money. However great this variety, the money demand of individuals and of communities still represents a pretty definite ratio of the value of exchanges effected. If the primary money alone were doubled in quantity, while the various forms of substitute money (smaller coins, bank-notes, government notes, etc.) remained unchanged, the quantity of money as a whole would not be doubled, and according to the theory, prices would not be expected to double. Indeed, in such a case, the method of exchange would be very greatly altered, and the case is fully covered by the statement of the theory.