But foreign commerce is not concerned with the sale of manufactured articles only. In its export trade, German industry was closely allied with German shipping and German finance. The services rendered German trade by the German merchant marine need not be reiterated; they are sufficiently well known. The relationship between the policies of German industry and the policies of German finance was no less important. The export of goods by German factories was supplemented by the so-called “export of capital” by German banks. Sometimes the German trader followed the German investor; sometimes the investor followed the trader. But whichever the order, the services rendered by the investor were to develop the purchasing power and the prosperity of the market, as well as to oil the mechanism of international exchange.[35] The industrial export policy and the financial export policy went hand in hand. Certainly this was the case in the Near East. The German Empire depended for its welfare, if not for its existence, upon an uninterrupted supply of food for its workers and of raw materials for its machines. But this supply, in turn, was conditional upon the maintenance and development of a thriving export trade. The allies of this export trade were a great merchant marine and a vigorous policy of international finance and investment. Thus the nation which in 1871 was economically almost self-sufficient, by 1900 had extended its interests to the four corners of the earth. This could not have been without its effects upon German international policy. “The strength of the nation,” said Prince von Bülow, “rejuvenated by the political reorganization, as it grew, burst the bounds of its old home, and its policy was dictated by new interests and needs. In proportion as our national life has become international, the policy of the German Empire has become international.... Industry, commerce, and the shipping trade have transformed the old industrial life of Germany into one of international industry, and this has also carried the Empire in political matters beyond the limits which Prince Bismarck set to German statecraft.”[36]