In this paper, we study how high school students reacted to the shocking news of a school shooting. The shooting coincided with national high-school matriculation exams. As there were exams both before and after the shooting, we can use a difference-in-differences analysis to uncover how the...

Most retrospective merger studies resort to the treatment effect approach, comparing the price dynamics in a treatment group and in a control group. We propose a systematic method to construct the groups, which applies to any industry with spatial competition. The method is consistent with the...

We employ the original Card and Krueger (1994) data and the CIC estimator to reexamine the evidence on the effect of minimum wages on employment. Our main finding is that the controversial result remains valid only for small fast-food restaurants. This finding is accompanied with a new possible...

Bilateral Investment Treaties BITs have become increasingly popular as a means of encouraging FDI from developed to developing countries. We adopt a matched difference-in-difference estimation to deal with the problem of endogeneity when estimating the effects of BITs on inward FDI. Our results...

In this paper we analyze Granger causality testing in a mixed-frequency VAR, originally proposed by Ghysels 2012, where the difference in sampling frequencies of the variables is large. In particular, we investigate whether past information on a low-frequency variable help in forecasting a...

We study hypotheses testing in the presence of a possibly singular covariance matrix. We propose an alternative way to handle possible non-regularity in a covariance matrix of a Wald test, using the identity matrix as the weighting matrix when calculating the quadratic form. The resulting test...

This paper uses a unique and large-scale quasi-experimental data to study the effect of deworming and school meals programs as a package on educational outcomes pupils test scores aggregate, French or math; enrollment, promotion or dropout rates in rural Senegal. We extend the endogenous...

In this paper we consider several modified wild bootstrap methods that, additionally to heteroskedasticity, can take dependence into account. The modified wild bootstrap methods are shown to correctly replicate an invariance principle for multivariate time series that are characterized by...

I use data from the South African Social Giving Survey to investigate the role of social capital and motivations for giving to formal charities and beggars. Results suggest that both impure altruism and inequality aversion positively influence giving to formal charities but they have no...

This note adds to the discussion originating from Card and Krueger (Am Econ Rev 84:772–793, <CitationRef CitationID="CR2">1994</CitationRef>) and Neumark and Wascher (Am Econ Rev 90:1362–1396, <CitationRef CitationID="CR3">2000</CitationRef>) by re-evaluating their results using the semiparametric difference-in-differences estimator introduced in Abadie (Rev Econ Stud...</citationref></citationref>