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

This Paper considers the financing of a research project under uncertainty about the time of completion and the probability of eventual success. The uncertainty about future success diminishes gradually with the arrival of additional funding. The entrepreneur controls the funds and can divert...