Marc Ivaldi
@marcivaldi
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Professor @EHESS_fr & @TSEinfoPast Président Association Française d'Economie des Transports Conference Director of the World Conference on Transport Research
Joined March 2010
I have argued for the introduction of a specific defense tax to finance at least some fraction of the additional European defense effort, the rest being financed by debt. There are two reasons for pushing such a tax. The first is economic. As the defense effort will, I am
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A discussion with Larry Summers about the effects of tariffs and other US policies on the US and on Europe. https://t.co/zxn2x0AN5a Larry’s place setter (15 minutes at the beginning) is a master class in showing the five fallacies underlying the US approach. In mine (the next
piie.com
Olivier Blanchard and Lawrence H. Summers, two of the world's most insightful policy macroeconomists, hold a deep discussion of the US and global implications of the Trump administration's economic...
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Toulouse School of Economics (TSE) is honored to host the 17th World Conference on Transport Research (WCTR) from 𝗝𝘂𝗹𝘆 𝟲–𝟭𝟬 https://t.co/hLUmkVuefb
linkedin.com
📆[EVENT] World Conference on Transport Research (WCTR) 2026 Toulouse School of Economics (TSE) is honored to host the 17th World Conference on Transport Research (WCTR) from 𝗝𝘂𝗹𝘆 𝟲–𝟭𝟬,...
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The Chinese are trolling America with memes on American re-industrialization. The music. 😂
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Since the US tariff rate on imports was 2.5%, it should be 2.7%. Very far from the 20% imposed yesterday. Either it is a margin for bargaining or it is a misunderstanding of the VAT.
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According to Trump administration's formula to compute reciprocal tarifs, the change in tariff rate applied to EU goods and services should be 8% since the goods and services imports of US from the EU are $924Billion and exports are $797Billion. 1/2 https://t.co/fh1hPxPBif
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Happy to announce that the website of the next World Conference on Transport Research to be held in Toulouse on July 6-10, 2026 is online. You are invited to submit your scientific contributions on the submission platform at
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Friendly reminder how to model most tariffs https://t.co/tQjzkqyPcW
Canada/Mexico tariffs could slow data center construction: "The tariff impact on electrical equipment for data centers is likely to be significant, said Ben Boucher, senior analyst for supply chain data and analytics at Wood MacKenzie." https://t.co/INmgq3J5qX
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I'm in The Times quoted on supply shocks and egg prices. Here is my fancy calibrated model of what happened
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Le 7-1 du match #FRIR utilisé par l'équipe de 🇨🇵 de rugby confirme l'évolution du rugby vers plus de flexibilité dans les postes #FFR @LNRofficiel
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Enough of the European gloom and doom. In the new world environment, Europe can and should have a major and exciting role to play. Namely, help create “coalitions of the willing”. The argument, based on a new article with @pisaniferry, https://t.co/INbWBI0JtP The Trump
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Ça c’est ma 🇫🇷 Le record jusque là détenu par les Chinois est battu. Une avancée sur la route vers la fusion nucléaire
#Fusion🔥| 1ère mondiale pour l'énergie de fusion ! 👀Nouveau record obtenu dans le tokamak WEST, opéré sur le centre CEA de Cadarache : il a maintenu un plasma de fusion chaud de plusieurs dizaines de millions de degrés pendant 22 minutes avec 2,6 gigajoules d'énergie injectée.
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At a minimum, the @deepseek_ai episode has exposed a dangerous degree of “groupthink” within the US AI industry, writes @DAcemogluMIT.
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That is to say, 0.004 percent of US Federal Budget. In 200 weeks, it would mean still less than 1% of the budget. 😜
🚨🇺🇸 DOGE CUTS QUICK: $45M SAVED BY DUMPING EMPTY FEDERAL BUILDINGS Elon's efficiency team terminated 22 government leases in less than a week, moving agencies from ghost buildings to existing space. The moves saved taxpayers $44.6M, up from $1.6M just days ago. And they're
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Exemple d'inculture économique ou de mauvaise fois ou les 2. Et le pire ce sont tous les moutons qui applaudissent.
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The paper mentioned is our killer acquisition work with @marcivaldi and @selcukunekbas
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Happy to read that @DAcemogluMIT is quoting our article forthcoming in ALJ @abaantitrust coauthored with @CompetitionProf and @selcukunekbas
This is a thread about remaking the tech sector. Silicon Valley still claims the mantle of “disruption”, as if it is made up of competitive small companies rushing to innovate in order to edge into established industries. The truth is that Silicon Valley is now home to the
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