William Fuchs

William Fuchs

Institution

UT Austin

PhD Year

2005

FTG Membership

Member

Website

https://sites.google.com/site/wfuchs/research

Featured Work

Time Trumps Quantity in the Market for Lemons

Oct 26, 2026

William Fuchs, Piero Gottardi, Humberto Moreira

We consider a dynamic adverse selection model where privately informed sellers of divisible assets can choose how much of their asset to sell at each point in time to competitive buyers. With commitment, delay and lower quantities are equivalent ways to signal higher quality. Only the discounted quantity traded is pinned down in equilibrium. With spot contracts and observable past trades, there is a unique and fully separating...


Demand-System Asset Pricing: Theoretical Foundations

Oct 25, 2026

William Fuchs, Satoshi Fukuda, Daniel Neuhann

Recent asset pricing methods estimate investor-level demand for financial assets. We show that leading demand systems omit the central mechanism of portfolio choice: substitution depends on payoff similarity under a latent measure reflecting the curvature of utility. Consequently, they do not enforce no arbitrage and may be severely biased—estimated elasticities can be near one even if true...


Who to Listen to? A Model of Endogenous Delegation

Oct 15, 2026

William Fuchs, Satoshi Fukuda, Mayar Sefidgaran

An organization must often make a collective decision on behalf of two units that hold different private information, prefer different outcomes, and cannot use monetary transfers. We ask which unit’s information should govern the collective decision, and within what limits. The organization commits to a decision rule before either unit learns its private information, and may choose...


Shaping Institutions

Oct 12, 2026

William Fuchs

We propose a simple model of the evolution of institutions, where leaders’ actions have a persistent effect by shaping the norms of the institutions they lead. This can lead to different long-run behaviors even for institutions with the same formal rules. The early history of leaders plays a crucial role in determining which outcome prevails. Every period, a leader decides to respect or abuse their...


A Trilemma for asset demand estimation

Oct 10, 2026

William Fuchs, Satoshi Fukuda, Daniel Neuhann

We derive fundamental limits to demand analysis in financial markets from two foundational principles of asset pricing: (i) investors value assets for their payoffs, and (ii) prices satisfy no arbitrage. Given these principles, we show that (iii) asset demand curves are not structural objects and that even perfectly exogenous supply shocks provide incorrect price variation for demand estimation. The only exception is the knife-edge case...


Self-enforcing contracts with persistence

Aug 6, 2026

William Fuchs, Jangwoo Lee

We show theoretically that, in the presence of persistent productivity shocks, the reliance on self-enforcing contracts due to limited legal enforcement may provide a possible rationale why countries with the worse rule of law might exhibit: (i) higher aggregate TFP volatilities, (ii) larger dispersion of firm-level productivity, and (iii) greater wage inequality. We also provide suggestive empirical evidence consistent with the model’s aggregate implications. Finally,...


Rules versus Disclosure: Prudential Regulation and Market Discipline

Feb 1, 2025

William Fuchs, Satoshi Fukuda

We study the joint design of two prominent micro-prudential policy tools: bank
regulation that enforces operational standards via rules, and market discipline through
information disclosure. Disclosure can be state-contingent but creates a trade-off between
incentives and the ex-post protection of weak banks. Hence, regulators use rules
to maintain incentives and imperfect disclosure to provide ex-post insurance. In the
optimal design, there...


Liquidity Sentiments

Nov 2, 2021

William Fuchs

We develop a rational theory of liquidity sentiments in which the market outcome in any given period depends on agents' expectations about market conditions in future periods. Our theory is based on the interaction between adverse selection and resale considerations giving rise to an intertemporal coordination problem that yields multiple self-fulfilling equilibria. We construct "sentiment" equilibria in which sunspots generate fluctuations in prices, volume, and...


Optimal Contracting and the Organization of Knowledge

Jul 30, 2018

William Fuchs, Luis Garicano, Luis Rayo

We study contractual arrangements that support an efficient use of time in a knowledge-
intensive economy in which agents endogenously specialize in either production or consulting.
The resulting market for advice is plagued by informational problems, since both the diffi-
culty of the questions posed to consultants and the knowledge of those consultants are hard to
assess. We show that spot...