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Trade, Tragedy, and the Commons

American Economic Review 2009 99(3), 725-749 open access
We develop a theory of resource management where the degree to which countries escape the tragedy of the commons is endogenously determined and explicitly linked to changes in world prices and other possible effects of market integration. We show how changes in world prices can move some countries from de facto open access situations to ones where management replicates that of an unconstrained social planner. Not all countries can follow this path of institutional reform and we identify key country characteristics (mortality rates, resource growth rates, technology) to divide the world's set of resource rich countries into Hardin, Ostrom and Clark economies. Hardin economies are not able to manage their renewable resources at any world price, have zero rents and suffer from the tragedy of the commons. Ostrom economies exhibit de facto open access and zero rents for low resource prices, but can maintain a limited form of resource management at higher prices. Clark economies can implement fully efficient management and do so when resource prices are sufficiently high. The model shows heterogeneity in the success of resource management is to be expected, and neutral technological progress works to undermine the efficacy of property rights institutions.

Which Countries Have State Religions?

Quarterly Journal of Economics 2005 120(4), 1331-1370 open access
Among 188 countries, 72 had no state religion in 2000,1970, and 1900; 58 had a state religion throughout; and 58 had 1 or 2 transitions. We use a Hotelling spatial competition model to analyze the likelihood that the religion market would be monopolized. Similar forces influence a government's decision to establish a state religion. Consistent with the model, the probability of state religion in 1970 and 2000 is increasing with the adherence rate to the main religion, has a nonlinear relation with population, and has little relation with per capita GDP. The probability of state religion decreases sharply under Communism, but lagged Communism has only a weak effect. With costly adjustment for institutions, the probability of state religion in 1970 or 2000 depends substantially on the status in 1900. This persistence is much stronger for countries with no major regime change than for countries with such a change.

Stock Price Reactions to the Repricing of Employee Stock Options*

Contemporary Accounting Research 2005 22(4), 791-828
We study whether the repricing of employee stock options is in the best interests of common shareholders by examining the excess stock returns associated with timely, noncontamin‐ated repricing announcements made by Canadian firms. On the basis of three theories of why firms reprice, we develop competing predictions about the mean announcement‐date excess stock return and the cross‐sectional relations among excess stock returns, the estimated probability of repricing, and proxies for predictions from each theory. For a sample of 72 noncontaminated repricing announcements made by Canadian firms between November 1994 and July 2001, we find a reliably positive three‐day announcement‐date mean excess return of 4.9 percent. The results of our cross‐sectional analyses suggest that the market responds favorably to repricings because they assist in retaining key employees even though, at the margin, they enable managers to extract rents from shareholders. We do not find sufficient statistically significant evidence to reliably conclude that repricings are done to realign employee incentives.

Consumer Demand and the Life-Cycle Allocation of Household Expenditures

Review of Economic Studies 1994 61(1), 57-80
The purpose of this paper is to estimate the parameters of household preferences that determine the allocation of goods within the period and over the life cycle, using micro data. In doing so we are able to identify important effects of demographics, labour market status and other household characteristics on the intertemporal allocation of expenditure. We test the validity of the life-cycle model using excess sensitivity tests and find that controlling for demographics and labour market status variables can largely explain the excess sensitivity of consumption to anticipated changes in income.

The Characteristics that Provide Independent Information about Average U.S. Monthly Stock Returns

Review of Financial Studies 2017 30(12), 4389-4436
We take up Cochrane’s (2011) challenge to identify the firm characteristics that provide independent information about average U.S. monthly stock returns by simultaneously including 94 characteristics in Fama-MacBeth regressions that avoid overweighting microcaps and adjust for data-snooping bias. We find that while 12 characteristics are reliably independent determinants in non-microcap stocks from 1980 to 2014 as a whole, return predictability sharply fell in 2003 such that just two characteristics have been independent determinants since then. Outside of microcaps, the hedge returns to exploiting characteristics-based predictability also have been insignificantly different from zero since 2003. Received January 28, 2015; editorial decision November 28, 2016 by Editor Andrew Karolyi.

The Effect of Bond Rating Agency Announcements on Bond and Stock Prices.

Journal of Finance 1992 47(2), 733-52
This paper examines daily excess bond returns associated with announcements of additions to Standard and Poor's Credit Watch List, and to rating changes by Moody's and Standard and Poor's. Reliably nonzero average excess bond returns are observed for additions to Standard and Poor's Credit Watch List when an expectations model is used to classify additions as either expected or unexpected. Bond price effects are also observed for actual downgrade and upgrade announcements by rating agencies. Excluding announcements with concurrent disclosures weakens the results for downgrades, but not upgrades. The stock price effects of rating agency announcements are also examined and contrasted with the bond price effects.

What Drives Taxi Drivers? A Field Experiment on Fraud in a Market for Credence Goods

Review of Economic Studies 2013 80(3), 876-891
Credence goods are characterized by informational asymmetries between sellers and consumers that invite fraudulent behaviour by sellers. This article presents a natural field experiment on taxi rides in Athens, Greece, set up to measure different types of fraud and to examine the influence of passengers' presumed information and income on the extent of fraud. We find that passengers with inferior information about optimal routes are taken on significantly longer detours, while lack of information on the local tariff system increases the likelihood of manipulated bills by about fifteen percentage points. Passengers' perceived income seems to have no effect on fraud.