To me, the most interesting piece of economics is economic geography. In this field they are looking at the benefits of geographic focus and co-location in places like Silicon Valley, the Route 128 corridor in Boston, Austin and its high-tech industry, or Hollywood and the film industry. These ideas from economic geography are the normative condition in industrial real estate development, not the abnormal. The idea that this strategy sets up a ‘dependency’ is just part of the existing natural order. Companies are inter-dependent by nature.