In addition to the 40 million soldiers, some 150 million people have been required to work on "war work" at home but they have simply been "switched" from other forms of production which have been correspondingly reduced. War supplies were demanded but these also largely "switched" the demand from former and industrial uses. Lord D'Abernon found that in England those objects of luxury "which would seem to be influenced not at all or only very remotely and to a very small degree by increased cost of labor and materials," such as old books, prints and coins, had, nevertheless, advanced, roughly speaking 50 per cent., during the war. Thus "scarcity" and especial "war demands" do not go far toward explaining the high price level even in Europe and not at all, I believe, in this country. In the United States while certain things have become scarce, including certain foods, the general mass of goods has been actually increased as a consequence of war. The raw materials used in the United States in 1918 were 16 per cent. more than in 1913 and 2 per cent. more than in 1917. The physical volume of trade is estimated variously to be in 1918 from 22 per cent. to 41 per cent. above that in 1913 and 8 per cent. above that in 1917. President Wilson, in his address to Congress, August 8, 1919, on the high cost of living, gave other impressive examples as to foods, especially eggs, frozen fowls, creamery butter, salt beef, and canned corn, showing that scarcity is not the cause of high prices. HIGH PRICES DUE TO MONETARY CAUSES The truth is that the chief causes of the rise of prices in war time are monetary causes. It is almost invariably true that the great price movements of history are chiefly monetary. This is shown, in the first place by the fact that countries of like monetary standards have like price movements. Thus--to consider gold-standard countries--there has usually been a remarkable family resemblance between the curves representing the rise and fall of the index numbers of the United States, Canada, England, France, Belgium, Holland, Scandinavia, Germany, Austria and Italy. Again, the price movements in silver countries show a strong likeness, as in India and China between 1873 and 1893. On the other hand, we find a great contrast between gold and silver countries or between any countries which have different monetary standards. In the World War the data are still too meager to enable us to express all the relations in exact figures, but we may arrange the different countries in the approximate order in which their prices have risen. The order of the nations corresponds, in general, with the order in which the currency in those nations has been inflated by paper as well as with the order in which their monetary units have depreciated in the foreign exchange markets.