In this paper, we explore two factors that can limit arming and, more generally, the costs of enforcement within and across states: governance or the formal organizations and institutions that help define and enforce property rights, and norms, or the informal arrangements in settling potential...

The past decade has witnessed an explosion of interest in the scientific study of happiness. Economists, in particular, find that happiness increases in income but decreases in income aspirations, and this work prompts examination of how aspirations form and adapt over time. This paper presents...

A recent notable development in the empirical macroeconomics literature has been the rapid growth of papers that build structural models, which include a number of frictions and shocks, and which are confronted with the data using sophisticated full-information econometric approaches, often...

An agent may be able to address a task at different times, with the state of nature more favorable to the task in some periods over others. Success on a task will therefore more greatly improve the agent's reputation following success on a task if he is constrained in choosing when to address...

We extend the traditional road investment model, with its focus on capacity and congestion as measures of capital and its utilization, to include free-flow speed as another dimension of capital. This has practical importance because one can view free-flow speed as a continuous proxy for road...

Consider an organization that solicits private contributions, which will partly be used to provide a public good. The organization's goals is to maximize its profits, namely the difference between aggregate contributions and the amount it spends on providing the public good. An equilibrium...

An altruistic agent who may aid a person with a low income may induce that person to exert little effort to increase his income. Such behavior generates a Good Samaritan Dilemma, in which welfare is lower than when no one is altruistic. Governmental transfers, which restrict reallocation from a...

I present a model of offshoring decisions with heterogeneous firms, random adjustment costs, and endogenous markups. The model shows an inverted-U relationship between firm-level productivity and the probability of offshoring; hence, the most productive firms are less likely to offshore than...

This paper develops a model of the public and private provision of liquidity and its relation to unemployment. We extend the Mortensen-Pissarides model of the labor market by adding an over-the-counter (OTC) market. Trades in the OTC market are collateralized with liquid assets, which are...

This paper addresses the puzzle of why redistributive legislation, which benefits a small minority, may pass with overwhelming majorities. It models a legislature in which the same agenda setter serves for two periods, showing how he can exploit a legislature (completely) in the first period by...