FOREIGN COMMERCE OF THE UNITED STATES Comparison with Domestic Commerce.-It is difficult to make an adequate and equitable comparison between domestic commerce and foreign commerce. At best, statistics are apt to mislead because of the failure to include all necessary qualifica tions. A few comparisons are hazarded, nevertheless, as throwing some light on this phase of United States commerce.
Since many commodities produced in the United States cannot enter export trade at all, estimates have been made of the propor tion of movable goods exported.
Estimates of the proportion of movable goods exported for se lected years since 1899, are as follows: Census Year Per cent Exported Census Year Per cent Exported 1899 12.8 1927 9'9 I9o9 9.6 1929 9.8 1914 10.2 1931 7'4 1919 16.o 1933 6.8 1921 12.8 1935 1923 8.9 1937 1925 1o• 1 1938 9.o A more equitable comparison lies in the figures for individual commodities because the overall figures conceal the very great importance of export markets for some of the more important products of the United States. Thus in 1933, 66% of all raw cot ton produced in the United States was exported. This ratio had fallen to 3o% by 1938. In the latter year exports of the gum rosin production amounted to 38%. In 1937, 43% of the prunes, 29% of the sardines, 19% of the production of tractors and parts, 43% of the borax, and 36% of all dried fruits were exported. Furthermore industries which export but a small fraction of their total output sometimes find that the foreign sales enabled them to step up production to a higher point with resulting reductions in unit costs of production. Export sales may indeed account for a substantial part of the net earnings of a company, even though they make up but a fraction of total sales.
services between the United States and the rest of the world amounted to approximately $7,500,000,000, of which merchandise exports and imports comprised but two-thirds. Shipping and freight services, travel expenditures, interest and dividends, and "immigrant" remittances were among the important types of service transactions which accounted for the other third. The in ternational movement of securities and the transfer of properties involve large amounts which in sum often exceed the value of merchandise exports and imports. Movements of gold and silver are set apart because of their especial monetary significance. (See Table XIII.) One reason for the widespread ignorance of the true nature of international trade has been the fact that data have not been available for all transactions until rather recently. Estimates of the balance of international payments for the United States have been compiled only since 1919 and other nations are gener ally behind the United States in the issuance of similar data. In sharp contrast are the statistics on merchandise exports and im ports which, for the United States, have been compiled since 1790 and are available in very great detail.