FEDS Paper: Sequence-Space Jacobians of Life-Cycle Models

Bence Bardóczy, Akshay Shanker, and Mateo Velásquez-GiraldoThe sequence-space Jacobian (SSJ) method of Auclert et al. (2021a) has made heterogeneous-agent models far easier to solve, fueling an explosion of applications. But even SSJ strains against capacity constraints when state spaces grow very large, as in economies with overlapping generations of heterogeneous agents (HA-OLG).

FEDS Paper: An Evaluation of Difference-in-Differences Methods Using Placebo Event Studies

John Coglianese and Jade A. FangResearchers are faced with the choice of which of the many recently developed difference-in-differences methods to use in practice. To assess these estimators' relative performance for single-unit event studies, we conduct 134,000+ state-level placebo event studies across 13 estimators. We find that no single method dominates.

Businesses often row back on ethics when times get tough. Here’s how technology can keep them on track

Five carmakers are involved in a case at the High Court in London over claims that they cheated on emissions tests. A decade ago, the “dieselgate” scandal broke, eventually forcing Volkswagen to pay billions of euros in fines and settlements. These carmakers (Mercedes, Ford, Peugeot/Citroën, Renault and Nissan) have all faced accusations that selling cars was more important to them than their environmental responsibilities. They all deny the allegations.

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