Working papers

This paper is concerned with inference about a function g that is identified by a conditional moment restriction involving instrumental variables.

In additive error models with a discrete endogenous variable identification cannot be achieved under a marginal covariation condition when the support of instruments is sparse relative to the support of the endogenous variable

Why have some countries done so much better than others over the recent past? In order to shed new light on this issue, this paper provides a decomposition of the change in the distribution of output-per-worker across countries over the period 1960-98

This paper examines changes in the distribution of wages using bounds to allow for the impact of non-random selection into work.

This paper examines the socio-economic consequences of teenage motherhood for a cohort of British women born in 1970.

This paper uses cross section data to investigate whether the returns to education vary with the level of ability. Using a measure of cognitive ability based on tests taken at ages 7 and 11 we find, unlike most of the existing literature, clear evidence that the return to schooling is lower for those with higher ability indicating that education can act as a substitute for observed ability.

This paper examines the relationship between foreign ownership andproductivity, paying particular attention to two issues neglected in the existing literature the role of multinationals in service sectors and the importance of R&D activity conductedby foreign multinationals.

We examine the contribution of human capital to economy-wide technological improvements through the two channels of innovation and imitation.

This paper studies the determinants of partnership dissolution and focuses on the role of child support.

The wage gap between male and female workers has narrowed in both the US and the UK over the past twenty five years.

This lecture explores conditions under which there is identification of the impact on an outcome of exogenous variation in a variable which is endogenous when data are gathered.

This paper models the short and medium-run impact of aid on migration, con-sidering alternatively the effect of unconditional and conditional cash transfers to financially constrained households.

This paper presents a model of international trade that features heterogeneous firms, relative endowment differences across countries, and consumer taste for variety.

Recent developments in the theory of choice under uncertainty and risk yield a pessimistic decision theory that replaces the classical expected utility criterion with a Choquet expectation that accentuates the likelihood of the least favorable outcomes.

In this paper we evaluate the effect of a large welfare program in rural Mexico.

We examine the impact of high school graduation on the probability individuals from welfare

This paper provides a discussion of stamp duty and its effects.

I show that a class of fixed effects estimators is reasonably robust for estimating the population-averaged slope coefficients in panel data models with individual-specific slopes, where the slopes are allowed to be correlated with the covariates.

This paper extends the nonparametric methods developed by Samuelson (1948), Houthakker (1950), Afriat (1973), Diewert (1973) and Varian (1982, 1983) to latently separable models.