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Synthetic Difference-in-Differences

By Dmitry Arkhangelsky, Susan Athey, David A. Hirshberg, Guido W. Imbens, and Stefan Wager

American Economic Review, December 2021

We present a new estimator for causal effects with panel data that builds on insights behind the widely used difference-in-differences and synthetic control methods. Relative to these methods we find, both theoretically and empirically, that this "synthet...

Product Innovation, Product Diversification, and Firm Growth: Evidence from Japan's Early Industrialization

By Serguey Braguinsky, Atsushi Ohyama, Tetsuji Okazaki, and Chad Syverson

American Economic Review, December 2021

We explore how firms grow by adding products. We leverage detailed data from Japan's cotton spinning industry at the turn of the last century to do so. This setting allows us to fully characterize the type of differentiation (vertical or horizontal) of ...

Delegation in Veto Bargaining

By Navin Kartik, Andreas Kleiner, and Richard Van Weelden

American Economic Review, December 2021

A proposer requires a veto player's approval to change a status quo. Proposer is uncertain about Vetoer's preferences. We show that Vetoer is typically given a non-singleton menu, or delegation set, of options to pick from. The optimal set balances the ex...

Optimal Lockdown in a Commuting Network

By Pablo D. Fajgelbaum, Amit Khandelwal, Wookun Kim, Cristiano Mantovani, and Edouard Schaal

American Economic Review: Insights, December 2021

We study optimal dynamic lockdowns against COVID-19 within a commuting network. Our framework integrates canonical spatial epidemiology and trade models and is applied to cities with varying initial viral spread: Seoul, Daegu, and the New York City metrop...

Do Women Respond Less to Performance Pay? Building Evidence from Multiple Experiments

By Oriana Bandiera, Greg Fischer, Andrea Prat, and Erina Ytsma

American Economic Review: Insights, December 2021

Existing empirical work raises the hypothesis that performance pay—whatever its output gains—may widen the gender earnings gap because women may respond less to incentives. We evaluate this possibility by aggregating evidence from existing experiments...

Cheating with Models

By Kfir Eliaz, Ran Spiegler, and Yair Weiss

American Economic Review: Insights, December 2021

Beliefs and decisions are often based on confronting models with data. What is the largest "fake" correlation that a misspecified model can generate, even when it passes an elementary misspecification test? We study an "analyst" who fits a model, represen...

Allocation Mechanisms without Reduction

By David Dillenberger and Uzi Segal

American Economic Review: Insights, December 2021

We study a simple variant of the house allocation problem (one-sided matching). We demonstrate that agents with recursive preferences may systematically prefer one allocation mechanism to the other, even among mechanisms that are considered to be the same...