Default contribution rates for 401(k) pension plans powerfully influence workers' choices. Potential causes include opt-out costs, procrastination, inattention, and psychological anchoring. We examine the welfare implications of defaults under each of these theories. We show how the optimal...

We study the effects of enabling peer supply through Airbnb in the accommodation industry. We present a model of competition between flexible and dedicated sellers - peer hosts and hotels - who provide differentiated products. We estimate this model using data from major US cities and quantify...

We study the effects of occupational licensing on consumer choices and market outcomes in a large online platform for residential home services. We exploit exogenous variation in the time at which licenses are displayed on the platform to identify the causal effects of licensing information on...

Digital platforms are increasingly the subject of regulatory scrutiny. In comparison to multiple competitors, a single platform may increase consumer welfare if network effects are large or may decrease welfare due to higher prices or reduction in platform variety. We study the net effect of...

In this paper, I show that, under relatively weak conditions, dynastic equilibria are never welfare optima. If a social planner sets policy to maximize a social welfare function, then, except in extreme cases where the planner cares only about a single generation, successive generations will...

Previous research shows that many people seek financial advice from non-experts, and that peer interactions influence financial decisions. We investigate whether such influences are beneficial, harmful, or simply haphazard. In our laboratory experiment, face-to-face communication with a randomly...

In settings with uncertainty, tension exists between ex ante and ex post notions of fairness (e.g., equal opportunity versus equal outcomes). In a laboratory experiment, the most common behavioral pattern is for subjects to select the ex ante fair alternative ex ante, and switch to the ex post...

We examine democratic policy-making in a simple institution with real-time agenda setting. Individuals are recognized sequentially. Once recognized, an individual makes a proposal, which is immediately put to a vote. If a proposal passes, it supercedes all previously passed proposals. The policy...

We propose an economic theory of addiction based on the premise that cognitive mechanisms such as attention affect behavior independently of preferences. We argue that the theory is consistent with foundational evidence (e.g. from neurosciencee and psychology) concerning the nature of...

In this paper, we provide a conceptual framework for understanding the phenomenon of exclusive dealing, and we explore the motivations for and effects of its use. For a broad class of models, we characterize the outcome of a contracting game in which manufacturers may employ exclusive dealing...