Economist @wb_research. Work on development, pollution, climate. Fmr:@StanfordECHOLab|@EPoDHarvard|@FulbrightNZ|@CSUAgSci 🐧s fan, everything outside, esp. ⛷️

Joined November 2011
Replying to @dwallacewells
"It works, in other words, when we tell people about the dream, not the nightmare."
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One of my favorite times of the year is now here - for the 16th year we are giving PhD students a chance to blog their job market papers on the Development Impact blog. Submissions now open, with a deadline of Wednesday November 4.
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Hi everyone! I’m on the academic job market 👀 Quick thread on my job market paper: “Water Allocation and Social Unrest: Evidence from Chilean Water Rights.” Link at the end.
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Sometimes we see personal statements that are 'personal' --- NO! It's badly named. It's just another place to talk about research. You really want to make it super clear you understand why getting a PhD isn't a terrible life choice for you. If you have any professional goal other than doing research, PhD is a bad idea. You could trick us of course, but again - you don't want to do that b/c it's a personally bad idea.
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Extraordinary scene in the Atacama desert of South America. Historically one of the world's driest locations has been completely transformed by heavy El Nino rain, leading to the proliferation of stunning flowers from long-dormant seeds.
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My first job market paper is finally published! (well, mostly; there's still a 2-year typesetting backlog) Will post on it more later. What a long slog. Celebrating now! direct.mit.edu/rest/article/… Free version: hagertynw.github.io/webfiles…
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My team is hiring a data scientist to work on AI safety. Your timeline is probably full of talk about AI-related risks. We measure and help mitigate these risks at Meta Superintelligence Labs. It has been the most rewarding leg of my career so far. Details below.
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🚨New working paper 🚨 How much better are we getting at manufacturing clean energy technologies? And how much of that improvement is driven by learning-by-doing? We answer these questions for wind energy. Watch this short video or read on for details.
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The only thing more inspiring than the advancing science of xenotransplantation is the indomitable spirit of the patients willing to undergo experimental treatments in pursuit of a better life for themselves and future generations. Thanks Tim: nytimes.com/2026/09/03/well/…
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Using a HEPA air purifier improved cognitive function by 12% in middle-aged and older adults. And they only used it for a month! That's a meaningful improvement in a short amount of time, all from a simple purchase you can make for your home.
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“Air pollution fell substantially as Paris restricted car traffic and made way for parks, people-streets and bike-lanes.” Better for the climate, better for health, better for livability and quality of life. Common sense. Such a no-brainer, it’s remarkable that more cities HAVEN’T done the same. washingtonpost.com/climate-s…
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This stopped me in my tracks. An independent study by @QMUL has found that after ULEZ was introduced, children’s lungs grew faster in Central London and have now caught up with children outside of the capital. Incredible.
Air pollution stunts children’s lung growth. New Queen Mary research found that improvements in air quality after the introduction of London’s ULEZ are associated with accelerated lung growth in children. Read more: shorturl.at/Jx86o
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It seems every time I look on this app, I see fierce Gretzky/Lemieux debates taking place. It must be the middle of August for hockey fans. But I, too, am bored, so I will now add my 2 cents. I think it's all based on how you define greatness. Gretzky is, without question, the most accomplished player in hockey history and had the greatest career in hockey history. He changed the game forever, dominated in ways never seen before, and produced numbers we'll never see again. But was he really the best player ever? Lemieux was so much more physically gifted that it's comical to even debate. What did Gretzky do better? Playmaking/passing, maybe, though it should be noted Lemieux was, at worst, the second best passer/playmaker in hockey history and could play that game as well as Gretzky if he felt like it. He was simply more of a shoot-first player than Gretzky, though very much a hybrid in that regard. And sure, Lemieux wasn't above taking a night off from time to time, something Gretzky was never accused of. But let's look at other facets: * Goal scoring in general? Lemieux by a mile * Shot power? Lemieux by a mile * Shot accuracy? Lemieux * Size/strength? Lemieux by a mile * Puck protection/reach? Lemieux by a mile * Breakaways? Lemieux by a country mile * Faceoffs? Draw * Defense? Lemieux (watch '91 and '92 playoffs if you disagree) * Hands? Lemieux * Skating? Lemieux, probably * Slap shot? Lemieux * Wrist shot? Lemieux * Backhand? Lemieux * Toughness: Lemieux * Clutch performance? Draw * Imagination? Draw (both utter geniuses) Then we must ask ourselves certain questions. Who had the better teammates from Day 1? Who was protected more by the NHL from Day 1? Who, based on size and physical ability, would have dominated 100 years ago or in this era more? Who else would have clearly been the best player in hockey after taking 3 1/2 years off before returning at age 35, putting up 35-41-76 in 43 games at the height of the dead puck era? Who else would have put up 30-26-56 in the next 20 games after missing two months due to cancer radiation treatments? I think these answers are pretty clear. There is a what-if quality to Lemieux's career that is part of his lore, and it's not Gretzky's fault. Gretzky was durable and generally had great health. Lemieux did not have anything close to good health, some of which was his fault. He smoked during the first eight years of his career and didn't always handle his back injuries in the manner his doctors asked. Part of this is on him, but he was also mauled and physically abused to the extreme, and the league did nothing to protect him. He played in the violent Patrick Division. He wasn't Gretzky. He was French. In those days, that was a rough combination. Much like Babe Ruth in baseball, the NHL always protected Gretzky. To this day, this is still the case. And, of course, it was not Lemieux's fault that he was diagnosed with cancer at 27. Physically, he was never quite the same after the diagnosis, his spring of 1993 scoring binge not withstanding. I was raised in Pittsburgh during the 1980s and 1990s. So, yes, I am admittedly biased. But I also know what I saw. And that was Lemieux's greatest appeal; to see him in person was to understand that you were seeing something that you'd never see again. If you took a bunch of aliens from outer space and invited them to a hockey game, and if no one was wearing numbers or names, they would all just fixate on him. Because you didn't need to understand the game to know he was different and better than everyone else. Who is the best player of all time? We'll never know. We have fun conversations like this all the time and there's no way to conclude. Everyone has their own opinion, their own view, their own philosophy. No one will ever accomplish more than Gretzky. He has more assists than anyone else has points, I've heard. I know. And it's amazing. No one had more great games than Gretzky and I'm hardly here to knock him. Legendary player, obviously, and a great ambassador for the game. But Lemieux, at his best and healthiest -- and sometimes, even when he wasn't healthy -- played hockey at level that has never been seen and that Gretzky wasn't physically capable of reaching. Who is the greatest of all time? Some say Gretzky. Some say Lemieux. Some saw Orr. Some say Howe. Some of the young people will say McDavid or Crosby. No one is right or wrong. But no one could do things on a hockey rink that Mario Lemieux could do, often in extremely compromised health. I'll go with him every time.
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The effects of the environment on the financial system are diverse and hard to anticipate
JUST IN: Extreme heat is threatening Italy’s “cheese banks,” where hundreds of thousands of Parmigiano-Reggiano wheels are stored as loan collateral.
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Pittsburgh is the greatest hockey city during my lifetime and it's because of Lemieux and Crosby
Sidney Crosby turns 39 today. On the captain’s birthday, I took a look at where he ranks in hockey (and Pittsburgh sports) history. He doesn’t have many equals. Free for all to read. Check it out here: nytimes.com/athletic/7471936…
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5 cups (1st), 6 cup finals (T1st), 9 ECF (T2nd), 15 scoring titles (1st), 7 Hart (1st), 9 Ted Lindsay (1st), (at least) 3 of the top 10 players of all time
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Sidney Crosby turns 39 today. On the captain’s birthday, I took a look at where he ranks in hockey (and Pittsburgh sports) history. He doesn’t have many equals. Free for all to read. Check it out here: nytimes.com/athletic/7471936…
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Opportunity for recent graduates and early-career professionals with strong quantitative and STEM skills. The University of Chicago Harris School of Public Policy is now accepting applications for the 2027–2028 Harris Social Impact Fellowship—an 11-month program that combines advanced academic training with hands-on research experience to prepare the next generation of evidence-driven leaders. The fellowship includes: • $75,000 living and healthcare stipend • Full tuition for the UChicago fellowship credential ($21,000) • Mentorship and professional development • Research placements at leading policy institutes across the University of Chicago Application details here: info.harris.uchicago.edu/soc…
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We've updated our paper on NYC congestion pricing with 1.5 yrs of post-policy data 🚗🚕🚙. Tl;dr: it's still working. Speeds in the CBD are persistently up, but the bigger story is the positive spillovers outside the CBD. Paper link: shoshanavasserman.com/papers…
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2026 is currently the 2nd worst smoke year on record in the US, behind 2023. Plot shows population-weighted daily cumulative PM2.5 exposure from smoke across the US. Note also how fundamentally different the last 6 years have been relative to previous two decades.
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