Historically, industry in Bolivia has been dominated by mineral processing and the preparation of agricultural products. However, in the urban center of La Paz, small plants carry out a large portion of the industry. Food, tobacco products, clothing, various consumer goods, building materials, and agricultural tools are produced. "The tin quotations from London are watched in La Paz with close interest as an index of the country's prosperity; a third of the national revenue and more than half of the total customs in 1925 were derived from tin; in short, that humble but indispensable metal is the hub around which Bolivia's economic life revolves. The tin deposits of Bolivia, second largest in the world, ... invite development."