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Marek Giebel

@marekgiebel.bsky.social

Associate Professor at the Department of Economics, Copenhagen Business School Research interests: Industrial Organization, Law and Economics, Intellectual Property Rights, and Finance http://www.marekgiebel.com/

42 Posts1125 Follower 834 Folgt

NBER @nber.org · 3d ago

Providing the first large-scale economic evidence on the frequency and purpose of workplace meetings, using administrative data from Norway, from David J. Deming, Katrine V. Løken, Alexander Willén, and Yaling Xu www.nber.org/papers/w35706

Lukas Lehner @lukaslehner.bsky.social · 5d ago

Glad to see our study on Walmart's consequences for poverty and food hardship appear alongside a number of exciting studies in the recent Issue of #LabourEconomics Special Issue: www.sciencedirect.com/special-issu... Our article: www.sciencedirect.com/science/arti...

VoxEU @ CEPR @voxeu.org · 3w ago

Eric S Rosengren & Niccolò Comati argue that the risks that led to the collapse of Silicon Valley Bank were visible the whole time, and that the collapse is less a story of hidden danger than of a supervisory system that polices process rather than risk. cepr.org/voxeu/column... #EconSky

NBER @nber.org · 4w ago

Providing a guide on imperfect competition in labor markets, focusing on the firm-specific labor supply elasticity as the definition of a firm’s labor market power, from Sydnee Caldwell, Arindrajit Dube, and Suresh Naidu www.nber.org/papers/w35608

VoxEU @ CEPR @voxeu.org · last mo.

Marco Perugini argues that the delay into entry in full force of the EU's AI Act results in a double bind in which Europe loses regulatory sovereignty whether it enforces its own rules or retreats from them. cepr.org/voxeu/column... #EconSky

The European Union's AI Act – the world’s most ambitious regulatory framework for artificial intelligence to date – was supposed to enter into full effect on 2 August 2026. But while the AI Act's transparency layer has come into effect, obliging providers to inform individuals when they interact with an AI system, its high-risk regime – covering biometric identification, recruitment systems, credit scoring, law enforcement, and border control – has been delayed. This column argues that the result is a double bind in which Europe loses regulatory sovereignty whether it enforces its own rules or retreats from them.

VoxEU @ CEPR @voxeu.org · last mo.

European patent data show that macroprudential tightening is followed by lower patenting and lower patent quality. However, financial-resilience tools carry no measurable short-run innovation cost and may support innovation over longer horizons. cepr.org/voxeu/column... #EconSky

Figure shows a map of Europe and how macroprudential tightening increased across European countries after CRR/CRD IV.

Macroprudential policy is designed to make the financial system safer, but it can also reshape the finance available to innovative firms. Using patent data matched to 2,844 firms in 21 European countries over 1990-2021, this column finds that macroprudential tightening is followed by lower patenting and lower patent quality. The effect is strongest when credit growth is weak and among financially constrained firms, and it is concentrated in instruments that directly restrict credit. By contrast, financial-resilience tools carry no measurable short-run innovation cost and may support innovation over longer horizons. The findings suggest that policymakers can protect financial stability without systematically penalising innovation, provided they are selective about which instruments they deploy.

Applied Young Economists' Webinar @ayew.bsky.social · last mo.

#econsky 🚨Reminder: You have 2 weeks left to submit your work! We’re looking forward to receiving your submissions!

Applied Young Economists' Webinar@ayew.bsky.social · 2mo ago

🚨CALL FOR PAPERS Hey #EconSky #EconTwitter! We are now accepting submissions for Season 13 of the Applied Young Economists Webinar! Deadline: Friday, 21 Aug 2026 Submission: forms.gle/5jsqgxLG1Jyvj8… (Email us your paper if you cannot access it) Details below⬇️

NBER @nber.org · last mo.

Rival firms linked by common ownership are more likely to form cartels and to sustain them longer. After a cartel dissolves, those ownership ties are reduced, from Vincent Abraham, @florianederer.bsky.social, and Catarina Marvao www.nber.org/papers/w35565

The Review of Economic Studies (REStud)@reveconstudies.bsky.social · last mo.

We examine the welfare cost of FX reserves in a small open economy where international arbitrage is driven by global financial intermediaries. This cost can be negative for safe-haven currencies. New paper by Bacchetta, Benhima, and Berthold restud.com/foreign-exch... #REStud #EconSky

Marek Giebel @marekgiebel.bsky.social · last mo.

Thank you, @profschrepel.bsky.social, for including our paper (with @anjaroesner.bsky.social) in your reading suggestions! Interested readers can access our paper on the relationship between managerial incentives and collusion here: doi.org/10.1016/j.je...

Redirecting

doi.org

Thibault Schrepel@profschrepel.bsky.social · last mo.

My July reading suggestions are out. Merger simulations tested at scale, AI agent collusion turning out to be more fragile than feared, backdoors in neural networks that no statistical test can catch, user innovation, and why the AI labs keep hiring philosophers. networklawreview.org/july-2026/

NBER @nber.org · 2mo ago

Analysis of 11 million US patents shows inventions have spread out in idea space since 1836, helping explain weaker spillovers and lower research productivity, from Ina Ganguli, Jeffrey Lin, Vitaly Meursault, and Nicholas F. Reynolds www.nber.org/papers/w35499

Jason Fletcher @jasonmfletcher.bsky.social · 2mo ago

Time to update our timeline of projects at americanmortalityproject.lafollette.wisc.edu Work on county health departments with @hamidnb.bsky.social Free access here: www.sciencedirect.com/science/arti...

VoxEU @ CEPR @voxeu.org · 2mo ago

Damien Capelle et al. show that the binding constraint on completing the EU banking union is forming relationships and entering markets, not prices or quantities on existing loans, and these barriers correlate with regulatory difference. cepr.org/voxeu/column... #EconSky

Figure shows the average policy distance by country pair. The average bilateral policy distance is 25%: a typical pair of euro area countries still differs on roughly one in four regulatory variables, despite a decade of banking union reforms – the Single Supervisory Mechanism, the Single Resolution Mechanism, and partial harmonisation of deposit insurance.

Despite major institutional reforms, the European Banking Union remains incomplete. Banking markets remain fragmented along national lines, which constrains Europe’s growth potential. This column uses loan-level data from the European credit registry combined with the bank group structure dataset to quantify where the barriers to cross-border lending lie, what role cross-country regulatory differences play, and how much output Europe forgoes as a result. It finds that the binding constraints sit on the extensive margin, that is, forming relationships and entering markets, that they are closely related to regulatory fragmentation, and that lifting them may deliver sizeable economic gains.

NBER @nber.org · 2mo ago

Data from 380 trillion tokens of AI consumption across more than 400 models (2 percent of global AI consumption) shows detailed effects of AI on firms, markets, and workers, from Nicola Borri, Aleh Tsyvinski, and Yukun Liu www.nber.org/papers/w35451

NBER @nber.org · 2mo ago

Competition reduces the rate of suboptimal choices, but does not drive it to zero, from David B. Huffman, Lamar Pierce, Alex Rees-Jones, and Germán J. Reyes www.nber.org/papers/w35454

VoxEU @ CEPR @voxeu.org · 3mo ago

T Choukhmane, T de Silva, W Lin, & M Akuzawa show that AI financial advice is broadly consistent with what economists would prescribe. However, it also varies by how prompts are written, with different advice by gender, financial literacy, and prior AI experience. cepr.org/voxeu/column... #EconSky

Figure shows observed behaviour versus LLM-recommended behaviour over the life cycle. Red: survey respondents’ reported behaviour; green: one-shot LLM advice at current circumstances; blue: full life cycle simulation following LLM advice each year.

The rise of generative AI has raised hopes that high-quality, personalised financial advice might finally become cheap and universally accessible. This column develops a method to quantify the impact of following AI financial advice over a lifetime. The authors find that on the decisions that matter most for long-run wealth, such as investing in diversified equity or building a savings buffer, today’s leading models give advice broadly consistent with what economists would prescribe. But what people get from AI depends as much on the model's ability as on how they write their prompts, with the advice varying by gender, financial literacy, and prior AI experience.

The Review of Economic Studies (REStud)@reveconstudies.bsky.social · 3mo ago

How does consumer data let platforms shape competition? Elliott, Galeotti, Koh, and Li show how platforms can use consumer data to segment markets for the benefit of firms or consumers. www.restud.com/market-segme... #REStud #EconSky

Ethan Mollick @emollick.bsky.social · 3mo ago

More evidence, from a large-scale study in China, that using AI hurts learning if it undermines mental effort. When homework time drops due to AI use, so do test scores. Across studies, there is a clear theme: AI tutoring in support of classes is good, using AI to "help" with homework is bad.

Philipp Heimberger @heimbergecon.bsky.social · 3mo ago

This paper finds that economists whose job market papers report (marginally) statistically significant results are more likely to secure academic jobs. Hiring committees prefer statistical significance; this creates incentives for researchers to p-hack.

Marek Giebel @marekgiebel.bsky.social · 3mo ago

🚨 New paper alert 🚨 I am happy to announce that the paper "Do managerial incentives facilitate anti-competitive behavior? Evidence from collusion" (with @anjaroesner.bsky.social , @rockwoolfonden.dk ) has been published in the Journal of Economic Behavior and Organization

Nicholas A. Christakis @nachristakis.bsky.social · 3mo ago

Even in Denmark, with its excellent provisions for children, parenthood marks a sharp divergence in academic careers (from employment to tenure to publications) for men and women -- for a variety of reasons reflecting both structure and agency. opus4.kobv.de/opus4-hsog/f...

Marek Giebel @marekgiebel.bsky.social · 3mo ago

🚨I am excited to announce our new working paper: "Artificial Intelligence, Communication, and Strategic Pricing: Evidence from Large Language Models" with @anjaroesner.bsky.social (@rockwoolfonden.dk) and Benjamin Schröder (@dice.hhu.de) Paper link (SSRN): papers.ssrn.com/sol3/papers....

Alex Bryson @alexbryson.bsky.social · 4mo ago

Are you a personnel economist? Why not join us next spring in Tokyo for the 2027 COPE Conference. Submit your extended abstract now. Full details are here: personneleconomics.eu/cope2027/ @sriucl.bsky.social

COPE 2027 – Colloquium on Personnel Economics

personneleconomics.eu

Marek Giebel @marekgiebel.bsky.social · 3mo ago

NBER @nber.org · 3mo ago

The five largest US tech firms are nearly doubling capex—from $380B in 2025 to $755B in 2026. They face bankruptcy unless productivity booms commensurately, from Jessica Wachter and Jonathan Wachter www.nber.org/papers/w35290

Caitlin Myers @caitlinmyers.bsky.social · 3mo ago

Is it the phones? New NBER WP this morning with Zeke Hooper: we estimate the diffusion of the iPhone explains 33–52% of the decline in US births from 2007–2011. #econsky🧵 www.nber.org/papers/w35310

Is the iPhone Birth Control? Causal Evidence from AT&T’s 2007–2011 Carrier Monopoly

Founded in 1920, the NBER is a private, non-profit, non-partisan organization dedicated to conducting economic research and to disseminating research findings among academics, public policy makers, an...

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Bruegel @bruegel.org · 3mo ago

📊 Chart of the week: Financial assets of households, by type of asset, share, 2025-Q3 📑 Read the Working Paper by Marie-Sophie Lappe and David Pinkus 🔗 buff.ly/dyJr65T #EconSky

Paul Goldsmith-Pinkham @paulgp.com · 3mo ago

In a new post, I pull data from four different sources --- arXiv, NBER working papers, SSRN, and the AEA --- to look at how much working paper growth and submissions have changed with the growth of AI. paulgp.substack.com/p/the-number...

VoxEU @ CEPR @voxeu.org · 4mo ago

Francesco Filippucci, Peter Gal, Katharina Laengle, Matthias Schief, & Muhammed A. Yıldırım show that AI-driven productivity gains will vary widely across countries. Maintaining competitiveness will ultimately require strong domestic #AI adoption. cepr.org/voxeu/column... #EconSky

Figure shows the predicted per capita real-income gains from AI over the next ten years. AI’s macroeconomic gains are expected to vary widely across countries.

Productivity gains from AI are expected to be significant, but how international trade shapes the cross-country distribution of these gains remains an open question. This column combines evidence on task-level productivity gains, sectoral AI exposure, and projected AI adoption with a global multi-country, multi-sector trade model to show that AI-driven productivity gains will vary widely across countries. A key insight is that while countries lagging in AI adoption can gain from cheaper imports of goods and services whose production benefits from AI, maintaining competitiveness in global markets ultimately requires strong domestic AI adoption.