Last year the World Bank made news when it announced that all its outputs would include a reproducibility package, which contains all the data and code needed to reproduce the figures and tables in the report. In this regard it is following the lead of major journals in economics. Compared with some other fields, such as clinical trials (Avenell & Bishop, 2026), the widespread availability of data and code in economics publications is impressive. Nevertheless, the confidence given by reproducibility packages needs to be tempered by one important consideration: a reproducibility package is only as good as the data that...