There is a long line, running from antiquity to the present day, which unites all those who believe in an open society. This school of thought bases the demand for liberty on the recognition of human ignorance; we need to be free because we are ignorant and fallible. Ignorance and Liberty examines how the market is a place which liberates us from this idea of a priviledged source of knowledge. The market is not only a place where goods are exchanged but also where different philosophical ideas and religious beliefs must co-habit, opening up new horizons and undermining the sense of an absolute that prevails in a closed world.