Lizi Yu | Searcharxiv

arXiv2025

A new equilibrium: COVID-19 lockdowns and WFH persistence

This paper documents a robust link between COVID-19 lockdowns and the uptake and persistence of working from home (WFH) practices. Exploiting rich longitudinal data, we use a difference-in-differences strategy to compare office workers in three heavily locked-down Australian states to similar workers in less affected states. Locked-down workers sustain 43% higher WFH levels through 2023 - 0.5 days per week - with a monotonic dose-response relationship. Persistence is driven by adjustments on both sides of the labor market: employers downsize office space and open remote or hybrid positions, while employees relocate away from city centers and invest in home offices and technology.

econ.GN↗

arXiv2021

Identification of Peer Effects with Miss-specified Peer Groups: Missing Data and Group Uncertainty

We consider identification of peer effects under peer group miss-specification. Two leading cases are missing data and peer group uncertainty. Missing data can take the form of some individuals being entirely absent from the data. The researcher need not have any information on missing individuals and need not even know that they are missing. We show that peer effects are nevertheless identifiable under mild restrictions on the probabilities of observing individuals, and propose a GMM estimator to estimate the peer effects. In practice this means that the researcher need only have access to an individual level sample with group identifiers. Group uncertainty arises when the relevant peer group for the outcome under study is unknown. We show that peer effects are nevertheless identifiable if the candidate groups are nested within one another and propose a non-linear least squares estimator. We conduct a Monte-Carlo experiment to demonstrate our identification results and the performance of the proposed estimators, and apply our method to study peer effects in the career decisions of junior lawyers.

econ.EM↗