Being the capital, Berlin is also the largest in Germany. Berlin is the transportation hub for aviation and railway in Europe, which also has the most tourists among the UN countries. While West Berlin is a consumer city that relies on the investments of West Germany, most of the industries are situated in the East. After Berlin was united, its economy mainly relies on business, financial industry, and service industry. Significant industries also include IT, pharmaceuticals, biomedical engineering, clean tech, biotechnology, construction and electronics.