One is to recognize that many (but by no means all) services are responsive to fundamental human needs, which are also part of our evolutionary inheritance and are not easily met in cities when people are removed from small close-knit social communities. Doctors exist because we like to live and because we dislike pain; artists and entertainers exist to bring us pleasure; hairstylists exist because some of us like to look good or need a sympathetic ear to listen; DJs exist because we like to dance; and bureaucrats exist because even the most passionate anarchists want the buses to run on schedule. Demand for these kinds of services did not increase as a result of improvements in manufacturing. They always existed. Instead, once agriculture and manufacturing were sufficiently productive to enable many people not to focus the bulk of their time and energy producing or making things, these other fundamental needs were amplified.