
Norman C Grosman Professor of Economics, University of Pennsylvania. Co-Founder of VoxChina @voxchina2017. My tweets are my own.
Philadelphia, PA
Joined November 2023
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Hanming Fang retweeted
New research shows that cities in China whose mayors compete more closely for promotion do less business with each other. Local SOE investment aligns with the political interests of mayors. When mayors don’t compete, the effect disappears. Read the brief: sccei.fsi.stanford.edu/china…
Hanming Fang retweeted
Dear President Kornbluth and Chairman Gorenberg,
Yesterday, as I am sure you are aware, a Boston jury unanimously found that @MIT professor Kristin Knouse defamed David Sabatini, falsely accused him of rape and sexual harassment, and tortuously interfered with his contractual arrangements including his tenure at MIT.
MIT and its tenure review committee relied on Professor Knouse’s statements when it took away David’s tenure and terminated him.
MIT's policies explicitly prohibit harassment, retaliation, and fabrication of claims. Falsely accusing a colleague of rape and sexual harassment and pushing for his termination under false pretenses are clearly violations of MIT policy.
In light of the unanimous findings of the jury after five years of discovery, many legal motions and countermotions by both parties, and a three-week trial in Suffolk County Superior Court in Boston:
Is MIT going to take away Knouse’s tenure and terminate her?
If not, why not?
Is MIT going to restore David’s tenure, and apologize for firing him?
If not, why not?
In light of what has transpired in this grave miscarriage of justice, MIT has the opportunity and the obligation to right a serious wrong here.
At a minimum, the public deserves transparency into what actions MIT is taking in this case as taxpayers are major funders of MIT.
Sincerely,
Bill Ackman
A civil jury ruled in favor of ex-MIT scientist David Sabatini, who was accused by a younger colleague of inappropriate sexual conduct in his Cambridge research lab, and awarded him $6 million in damages. trib.al/s3v9VIX
Hanming Fang retweeted
The narrative is blame China and trade, and it’s mostly wrong. The general point is that areas relatively more exposed to negative demand shocks saw more job losses and had a hard time adjusting or did not adjust at all. The China Shock lit is based on a clever way to identify a particular type of negative demand shock (import competition). It only shows areas more exposed lost more jobs relative to less exposed regions. It cannot credibly produce a general equilibrium total job loss number. What we learned is adjustment to those shocks is hard. What politicians heard is only China Shock bad, must reverse China Shock. It’s a rhetorical question but there were 2 million manufacturing jobs lost during Great Recession, what are doing about that? It appears to be, almost nothing, because there is no clever ID strategy.
Hanming Fang retweeted
I also see the "China shock" literature as an example of how economists do a lot of economic history, just badly.
Studying how property rights uncertainty affects prices and speculative activities in the housing markets using a natural comparison of full and limited property houses in Shenzhen, from @HanmingF, Jing Wu, and Vincent Yao nber.org/papers/w35797
Hanming Fang retweeted
High-speed rail may have helped fuel China’s EV boom by easing range anxiety and spurring charging rollout while amplifying its impact. HSR may account for up to one-third of China’s EV market-share growth, highlighting complementarities between intercity transit and EV adoption.
Hanming Fang retweeted
Exactly one month from today, the United States turns 250. To mark it, the Penn Initiative for the Study of Markets @Penn_Exchange is offering a free online course on the economic foundations of the American Founding.
I will lecture on June 23 and July 28, alongside Alan Taylor, Woody Holton, Joseph Wallis, and Jack Rakove, among others.
The course follows the story from colonial settlement to the early republic, showing how economics and institutions shaped political choices at every turn: the road to independence, the Revolutionary War, the Constitutional Convention, and the rival visions of Hamilton and Jefferson.
This is one of my favorite subjects in economic and legal history.
Details and registration here:
american-founding.org/
Hanming Fang retweeted
A few months ago I sat through a PhD student's talk that wasn't great. Clear delivery, well prepared. The ideas just weren't there yet. Several professors asked tough but respectful questions. Exactly what's supposed to happen.
For a while there, this had become suspect. Critical feedback from someone with more power directed at someone with less got coded as punching down, especially in public. That norm seems to have receded, thankfully, but plenty of people still treat the practice as immoral.
I want to defend it. Scratch that. I want to defend punching, full stop. Up, down, sideways.
Science runs on Merton's principle of universalism: evaluate ideas, not the person attached to them. The "don't punch down" rule violates that. Worse, it ends up infantilizing the people it claims to protect. Telling junior scholars their work is too fragile to scrutinize is not respect.
New essay, free for all. Punch back in the comments.
open.substack.com/pub/michae…
Hanming Fang retweeted
Incoming Skyline Scholar Hanming Fang's (@HanmingF) recent research reveals that China's fertility decline is driven by what women want, not what the government permits. Read the latest SCCEI China Brief for research insights: sccei.fsi.stanford.edu/china…
Hanming Fang retweeted
One of the more frustrating trends in public life over the past decade is how people who lead failing institutions blame social media for their failures.
A university president whose faculty have become political activists instead of educators and whose administrators multiply like rabbits will tell you that “misinformation on social networks” is eroding public trust in higher education. An editor whose publication lost its readership will claim that the real problem is X, rather than consider that the publication became boring, that the writing was uniformly uninspired, and that it stopped covering anything that mattered. A politician who loses an election will blame Meta algorithms rather than admit that voters simply did not like what was offered. A central banker whose institution missed the worst inflation in 40 years will worry publicly about TikTok videos spreading financial illiteracy.
The pattern is always the same. The institution fails at its core mission. The public notices. The people in charge, rather than examining what went wrong, identify an external force that is “polarizing.” The diagnosis is never “we did a poor job.” It is never “we lost our audience because we gave them nothing worth reading.” The diagnosis is always “bad actors are distorting the conversation.”
This is not new, of course. Before social media, talk radio was the scapegoat. Before talk radio, it was television. Before television, it was tabloid newspapers. Every generation of leaders has found a communication technology to blame for people’s loss of trust in them.
What is new is the intensity and the shamelessness. Over the last few years, “social media” has become a universal excuse that requires no evidence and tolerates no scrutiny. It is deployed reflexively.
The people who make this argument never seem to ask the obvious question: why are people on social networks so receptive to criticism of your institution in the first place? If your university were delivering excellent education at a reasonable price, no number of tweets would persuade parents otherwise. If your publication were covering important questions with clarity and substance, readers would not have migrated elsewhere. If the work you showcased were serious rather than trivial, people would still be paying attention.
Trust is not destroyed by social media. Trust is destroyed by poor performance, and social media makes it harder to hide. That is a different thing entirely, and the people running these institutions know it, which is what makes the excuse so cynical.
The honest version of the argument would be: “We used to be able to fail quietly because there was no mechanism for people to compare notes. Now there is, and we do not like it.”
That, at least, would have the virtue of being true.
Hanming Fang retweeted
In a new @JHealthEcon study, LDI Fellow @HanmingF examines why insurers on the Federally Facilitated Marketplace may cover some counties but not others, and what it means for patients.
Read more here: ldi.upenn.edu/our-work/resea…
Hanming Fang retweeted

ROCKWOOL Foundation Berlin@RF_Berlin4 Nov 2025
🇩🇪
GermanyConnected via Spain App StoreAccount-level information, not a live location or per-post device.
🆕 RFBerlin Working Paper! @HanmingF, Jiayin Hu & Miao Yu show that longer paid maternity leave in China reduces women’s job callbacks by 17%, pushing them toward lower-paying jobs and longer job searches. Crucially, firm subsidies helped offset the gap. 🔗rfberlin.com/network-paper/m…
Hanming Fang retweeted
Investigating the unintended consequences of maternity leave extension on gender gaps in the labor market, from @HanmingF, Jiayin Hu, and Miao Yu nber.org/papers/w34304
Hanming Fang retweeted
How physicians adjust their clinical decision-making following medical malpractice lawsuits and how these responses are driven by mental rather than financial costs and do not align with rational expectations, from @HanmingF, Ming Li, and Jia Xiang nber.org/papers/w34115 nber.org/papers/w34115
Hanming Fang retweeted
Industrial policy in China: Four key facts
Last month on VoxDev, @HanmingF (@penneconomics), Ming Li (@CUHKofficial) & Guangli Lu (@CUHKofficial) analysed industrial policy in China across various levels of government: voxdev.org/topic/macroeconom…
Hanming Fang retweeted
Panle Jia Barwick, Hyuk-soo Kwon, Shanjun Li,Nahim Bin Zahur found a learning rate of 7.5% in EV battery production, i.e., doubling the cumulative output lowers the unit cost by 7.6%. LBD explains 36% of battery cost reduction observed during 2013–2020.
voxchina.org/show-3-402.html


























