"This paper examines city formation in a country whose urban population is growing steadily over time, with new cities required to accommodate this growth. In contrast to most of the literature there is immobility of housing and urban infrastructure, and investment in these assets is taken on...

"We identify incentives generated by the Bretton Woods II system that may have contributed to the sub-prime liquidity crisis now working its way through the international monetary system. We then evaluate the persistent conjecture that the liquidity crisis is or will become a balance of payments...

"A salient feature of the recent U.S. recession is that output and employment have declined more in regions (states, counties) where household leverage had increased more during the credit boom. This pattern is difficult to explain with standard models of financing frictions. We propose a theory...

"This paper analyzes options for reforming the U.S. housing finance system in view of the failure of Fannie Mae and Freddie Mac as government sponsored enterprises (GSEs). The options considered include GSE reform, a range of possible new governmental mortgage guarantee plans, and greater...

"This paper explores the practice of mortgage refinancing in a dynamic competitive lending model with risky borrowers and costly default. We show that prepayment penalties improve welfare by ensuring longer-term lending contracts, which prevents the mortgage pools from becoming...