Jacques Crémer

[TSE REFLECT]

🧠At the crossroads of the world’s key transitions, infrastructure challenges are mounting up. From water shortages and housing costs to power cuts and rail upgrades, this TSE Reflect shows how economists can clear the way forward.


📰Read it here https://bit.pulse.ly/kqhbo45q41

📣 CALL FOR PAPERS – WCTR 2026
📍 Toulouse | 🗓 July 6–10, 2026
🚨 Submit by Sept 1, 2025
Topics: transport policy, planning, logistics, demand, land use & more!
🔗 www.wctr2026.fr/submission
#WCTR2026 #TransportResearch #Econsky

Yinghua was a great scholar, but it is his smile I am missing the most.

And there it was!

and a few more questions about time format, multiple races, how I wanted the output displayed, styling etc., as well as whether a plain HTML/JavaScript app was fine.

It answered:
Great! Here are a few questions to help clarify your requirements and make the project more precise:
Input Method:
How do you want to input the start time and your arrival time? (e.g., manually via a form, reading from a file, using a button to "start" and "arrive", etc.)
Platform:
...

Here is what I asked. "I would like to build a small project that computes the time elapsed between the start of a race and my arrival. You can ask me questions to make is more precise."

The app computes the time between the start of a race and an arrival time. It is minimal but it is easy to enter the input.

This is unbelievable! I know nothing at all about programming. I downloaded Cursor. I gave it instructions in plain English; it asked for details and within five minutes (I swear) it had built a simple web app. I did no coding whatsoever.

Digital Platform Regulation

@proffionasm.bsky.social has just published a compilation of her recent writing on Digital Platform Regulation, much of which is focused on European Regulation.
I am very honored to be a co-author on a few of the chapters.

You can get you free copy at
som.yale.edu/centers/thur...

From the ukraine community on Reddit: Former President of Poland Lech Wałęsa wrote the following letter to Trump Explore this post and more from the ukraine community

I somehow missed this open letter from Lech Walesa when it first came out, following the Trump-Zelensky meeting in the White House... It's worth a read.
www.reddit.com/r/ukraine/co...

Do I understand correctly. Harvard corrupts the minds of its students. The Trump administration wants to protect international students from this corruption, while making it more accessible to American students?

Congratulations to these three fantastic economists, and specially to @dianecoyle1859.bsky.social !

The election of Cardinal Prevost as pope is prophetic. At the time where the US turns to "America First", the pope is an American who dedicated a major part of his life to serving another, poorer, country.

A lesson for all rich countries.

It seems that there is a distinct possibility that Musk has lost more through the decrease in Tesla stock than he saved the US government.

If they had thought this through, maybe they would have realized there was scope for a mutually beneficial trade.

How China Took Over the World’s Rare Earths Industry China seized mines and built factories. Japan took note and invested in Australia. But the United States did little despite concerns about control of supplies.

I am sure there are important lessons here, but I am not sure what they are beyond the totally obvious (and useless) "be smarter and more strategic".
www.nytimes.com/2025/04/16/b...

This has been a long standing problem. Already, in the 1st book of Samuel the Jews ask for a king despite the fact that God, through the mouth of Samuel, warns them against it!

How do I inform Bluesky's algorithm that one cute cat picture a week is plenty? And one 10s video a year.

Alissa belongs to our little "Yale" discussion group, and she is great. This is a very lucid explanation of the difference between regulation and lawsuits in the context of social media.
@alissacooper.bsky.social

I am so smart 🧠! I have figured out the strategy behind the tariffs. They will indeed cut off the supply of fentanyl to the US:
the gangs will turn to more lucrative forms of smuggling, like Chinese plastic bath toys. 💡

I have not seen any discussion of the administrative difficulties of managing the tariffs.
I cannot believe that this is going to go well. Setting up all the reporting, collecting and policing mechanisms is a huge endeavor.
Imported goods will be more expensive, but also some will never arrive.

I know that the Trump administration cares only about trades in goods, but still, the US has a huge trade surplus in educational services, and they are killing it. 🤷‍♂️

It is an unfair trade practice for Chinese to produce American flags!?!?

On top of the many other idiocies involved, it never seems to occur to these people that the workers who will make the iPhones, or the steel, or... will have to be taken away from some other activity. What is it that they will not be producing?

As economist, I am flabbergasted by the self-harm inflicted on the US.
As a strong Americanophile, I am devastated by what MAGA ideology does to (and reveals about? ) the soul of America.

David Brooks is must reading on this last point.

www.nytimes.com/2025/04/03/o...

But it would be a wrong guess! @drodrik.bsky.social explains it much better than I can.

bsky.app/profile/drod...

And on the site you find this wonderful sentence "The expected mean future U.S. tariff on China rose more under President Biden than under President Trump."

Just looked at his website www.kimjruhl.com. He mentions that he is on leave from the University of Wisconsin up to April 2026, but does not mention that he is on the Council of Econ Advisers. Ashamed? +

➡️The unlikely is as wrong as in the sentence "Playing Russian roulette with a fully loaded gun is unlikely to lead to a long life".
➡️The problem is not that the formula is simplistic, it is that it is bonkers!

The subtitle of the article on the other hand is totally misleading "An overly simplistic formula for “reciprocal tariffs” is unlikely to lead to the elimination of trade deficits, trade experts warn."
.🧵