This paper provides systematic evidence on the macroeconomic consequences of war using a new dataset covering 115 conflicts and 145 countries over the past 75 years. We document three main findings.

Philippe Aghion, Peter Howitt, and Joel Mokyr. Philippe Aghion, research associate Peter Howitt, and NBER board member Joel ...

We use recent advances in natural language processing and large language models to construct novel measures of technology exposure for workers that span almost two centuries. Combining our measures ...

What does homeless shelter achieve? We leverage administrative records of homeless services in Los Angeles County to construct a novel dataset of daily, site-level counts of shelter beds and occupants ...

The NBER Board of Directors appointed 51 research associates, 49 of whom were promoted from faculty research fellows, at its September 2025 meeting. Two of the new appointees were former research ...

We examine global trends in productivity and sectoral dominance across countries and industries, asking whether changes are driven by productivity catch-up or shifts in factor endowments. To address ...

Cellphone bans in schools have become a popular policy in recent years in the United States, yet very little is known about their effects on student outcomes. In this study, we try to fill this gap by ...

In addition to working papers, the NBER disseminates affiliates’ latest findings through a range of free periodicals — the NBER Reporter, the NBER Digest, the Bulletin on Health, and the Bulletin on ...

Are state-imposed behavioral remedies effective substitutes for federal antitrust enforcement? We evaluate state regulation of hospital mergers under Certificates of Public Advantage (COPAs). Using ...

Utilizing large-scale surveys of over 27,000 respondents across 13 advanced and emerging market economies conducted between April and May 2024, we examine how knowledge, beliefs, and preferences ...

In addition to working papers, the NBER disseminates affiliates’ latest findings through a range of free periodicals — the NBER Reporter, the NBER Digest, the Bulletin on Health, and the Bulletin on ...

Using patient-level data from Taiwan's drug-eluting stent (DES) market in the Taipei metropolitan area, we estimate a structural model of hospital behavior, incorporating patient demand and hospitals' ...