We discuss how leverage can be monitored for institutions, individuals, and assets. While traditionally the interest rate has been regarded as the important feature of a loan, we argue that leverage is sometimes even more important. Monitoring leverage provides information about how risk builds...

We evaluate the impact of portfolio constraints on financial markets in a dynamic equilibrium pure exchange economy with one consumption good and two CRRA investors that may differ in risk aversions, beliefs regarding the dividend process and portfolio constraints. Despite numerous applications,...

We study a model with restricted investor participation in which strategic arbitrageurs reap profits by exploiting mispricings across different market segments. We endogenize the asset structure as the outcome of a security design game played by the arbitrageurs. The equilibrium asset structure...

This paper is studies the general equilibrium implications of arbitrage trades by strategic players in segmented financial markets. Arbitrageurs exploit client`ele effects and choose to specialize in one category of trades, taking into consideration all other arbitrage strategies. This results...

This is the graduation speech I gave on receiving an honorary doctorate at the University of Athens Economics and Business School. I talk about my Greek family, about how I got interested in economics, and then how in the 1990s I came to think about default, collateral, and leverage as the...

On the fourth anniversary of the original paper by Shojai and Hahn we will look at whether any of the predictions made in that article have come true. The authors suggested that revolutionary technologies, such as the Internet and wireless devices, would over time make it possible to derive...

In this paper, we study the quantitative implications of a real business cycle model where the firm is the capital owner, households are heterogeneous, and markets are incomplete due to restricted asset trade. Since, under these assumptions, the usual firm objective is no longer well defined,...

In an economy with a non-atomic measure space of assets and exchangeable risks, the Arbitrage Pricing Theory (APT) holds exactly; and factors are structurally specified, which allows for an economic interpretation.

The coordinating role of a redundant security is its role in markets with transaction costs to coordinate different consumers’ security demands so as to clear all security markets and, simultaneously, attain a given commodity allocation. The purpose of this paper is to prove that, under some...

Many recent papers in macroeconomics have studied the implications of models with household heterogeneity and incomplete financial markets under the assumption that households own the stock of physical capital and undertake the intertemporal investment decisions. In these models, production...