In her book 'The Economy of Cities' (1969) Jane Jacobs predicts that the cities will become the mines of the future. Since this mining of materials is best done close to the point of production (of waste) she even predicts great economical advantages for big cities. "In the highly developed economies of the future, it is probable that cities will become huge, rich and diverse mines of raw materials. ... The largest, most prosperous cities will be the richest, the most easily worked, and the most inexhaustible mines. Cities that take the lead in reclaiming their own wastes will have high rates of related development work."