Why are some cities specialised and others diversified? What are the advantages and disadvantages of urban specialisation and diversity? To what extent does the structure of cities, and the activities of the firms and people in them, change over time? How does the sectoral composition of cities...

This paper reviews a growing literature investigating how ‘immigrant’ diversity relates to urban economic performance. As distinct from the labor-supply focus of much of the economics of immigration, this paper reviews work that examines how growing heterogeneity in the composition of the...