This paper examines the impact of protectionist policies on exports within global value chains (GVCs), using the COVID-19 pandemic as a natural experiment. Leveraging UK customs data (2017–2020) and a shift-share identification strategy, we estimate an elasticity of exports with respect to...

Innovation is widely believed to play an important role in addressing climate change. Nevertheless, estimating such effects is difficult due to the endogeneity of innovation measures. I use a novel shift-share instrument building from cross-border patent citations to deal with this endogeneity....

A recent econometric literature shows two distinct paths for identification with shift-share instruments, leveraging either many exogenous shifts or exogenous shares. We present the core logic of both paths and practical takeaways via simple checklists. A variety of empirical settings illustrate...

We analyze the impact of tourist flows on local labor markets, following a novel identification strategy that uses temporary shocks in alternative international destinations to instrument for tourism flows across Spanish regions. We find that a one standard deviation increase in tourist inflows...

A recent econometric literature shows two distinct paths for identification with shift-share instruments, leveraging either many exogenous shifts or exogenous shares. We present the core logic of both paths and practical takeaways via simple checklists. A variety of empirical settings illustrate...