Publications

51 Publications
Journal Article
We present a model in which an asset bubble can persist despite the presence of rational arbitrageurs. The resilience of the bubble stems from the inability of arbitrageurs to temporarily coordinate their selling strategies. This synchronization problem together with the individual incentive to time the market results in the persistence of…
Journal Article
This paper evaluates the equity premium using novel data on the consumption of luxury goods. Specifying utility as a nonhomothetic function of both luxury and basic consumption goods, we derive pricing equations and evaluate the risk of holding equity. Household survey and national accounts data mostly reflect basic consumption, and therefore…
Journal Article

Conventional tests of the predictability of stock returns could be invalid, that is reject the null too frequently, when the predictor variable is persistent and its innovations are highly correlated with returns. We develop a pretest to determine whether the conventional t-test leads to invalid inference and an efficient test of…

Journal Article
How should monetary policy and macro-prudential regulation respond to the dangers of financial bubbles? I argue that bubbles - and their collapse - become a serious problem when there is inadequate risk-sharing. Neither monetary policy nor traditional macro-prudential regulation is designed to deal with this risk-sharing problem. Monetary policy…
Journal Article
This article studies the full equilibrium dynamics of an economy with financial frictions. Due to highly nonlinear amplification effects, the economy is prone to instability and occasionally enters volatile crisis episodes. Endogenous risk, driven by asset illiquidity, persists in crisis even for very low levels of exogenous risk. This phenomenon…
Journal Article
Exploiting a unique institutional setting in Korea, this paper documents that politicians can increase the amount of government resources allocated through their social networks to the benefit of private firms connected to these networks. After winning the election, the new president appoints members of his networks as CEOs of state-owned firms…