Replicability ensures that policy decisions are based on robust evidence. This requires transparency about the models being used, access to data, and documentation of how studies are set up. Replication studies repeat an original analysis using different data and are thus especially useful for policy work.
Academic study often focuses on specific novel results, which may limit the external validity of findings in a different setting. Evidence-based policy decisions require information on whether a particular finding is robust with regard to changing the underlying setting.