In 1920s Chicago a strong and influential tradition of sociological research was kick-started by Robert Park , who encouraged his students to engage with the society they were studying. Laurie Taylor presents the third of five programmes from Chicago, where he has gone to find out if the research tradition is still flourishing. 3: Trading Places. Asocial anthropologist guides Laurie Taylorthrough the trading floors of the Chicago mercantile exchange, where the tradition of open outcrytrading is being challenged by the Silence Of e-trading. Producer Tony Phillips