I am a PhD Candidate in Economics at Columbia University. I am mainly interested in political economy, media economics and organizational economics.
My research combines economics and machine learning to understand how information is produced, transmitted, and influences social and political outcomes.
I will join ETH Zurich as a Post-Doctoral researcher in Fall 2026.
Research
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An Image is Worth 1000 Words? Partisanship and Attention in Videos
(Job Market Paper)
Abstract
Political news today is increasingly consumed in attention-scarce, video-based environments. Yet existing research on media partisanship remains text-centric and implicitly assumes long-form, attentive processing. This paper studies how partisanship operates in video news through the transmission of multimodal signals: images and text. I develop a multimodal measure of video partisanship to quantify partisan content in video news and decompose the contribution of each modality. I show that the informational strength of each modality depends on attention: images convey partisanship rapidly through affective cues, while text operates through substantive information that requires sustained exposure to accumulate. A survey experiment using real news footage shows how these properties shape viewers’ responses to political videos. Partisan images elicit immediate emotional responses even under brief exposure, whereas partisan text shifts policy attitudes only with sustained exposure. Overall, the results show how low-attention video environments reshape persuasion, by filtering out substantive textual information, and relying mostly on the emotional effect of visual signals. Efforts to improve media quality must account for the asymmetric roles of visual and textual content.
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The Mechanistic Fixed-Effects Topic Model: Recovering Corporate Culture from Employee Reviews
(with Dan Biderman, David Blei, Wei Cai, Amir Feder & Andrea Prat)
Abstract
Social scientists often use topic models to study documents produced by different authors in different contexts, even though the same broad topic may be expressed differently across environments. Existing methods typically control for this variation ex post and cannot separate global themes from environment-specific language. Their reliance on word counts creates a second problem, as concepts expressed through context, phrases, and tone may never emerge as coherent topics. We introduce the mechanistic Fixed Effects Topic Model (mFETM), which incorporates fixed effects directly into the generative process and represents documents as interpretable concepts extracted from a large language model with sparse autoencoders (SAEs). Applied to a large corpus of Glassdoor reviews, mFETM recovers topics that are more stable across observed environments without sacrificing fit. When used to distinguish the best employers, mFETM identifies substantive workplace dimensions and retains substantially more of its fit after the topics most associated with observed environments are removed. Finally, the SAE representation allows us to generate counterfactual reviews by steering along the estimated fixed-effect directions, holding a theme fixed while its environment changes.
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With or Without Conditions? Equity-Efficiency Tradeoffs in Municipal Transfers in Brazil
(with Luigi Caloi)
Abstract
To improve service delivery, central governments can tie intergovernmental transfers to local policy performance. While performance-based transfers incentivize local governments and generate efficiency gains, they also shift transfers from low- to high-capacity governments, creating welfare-reducing inequities. We study this equity-efficiency trade-off using a bundle of transfer reforms to Brazilian municipalities. When two states tied transfers to relative educational performance, student test scores rose substantially: moving from the 25th to the 75th percentile of per capita conditional transfers increased scores by 0.16 standard deviations. However, the reform also widened funding disparities across municipalities, which translated into disparities in municipal expenditures in multiple sectors. In contrast, contemporaneous reforms to unconditional transfers had negligible effects on student outcomes. We use a simple model of optimal transfers to interpret these findings. Our results suggest that the introduction of performance based transfers delivered large efficiency gains, limited welfare losses from inequities, and was welfare-enhancing. We find minimal evidence of multitasking distortions or score manipulation. Instead, we document improvements in the quality of education inputs and find suggestive evidence of reduced corruption.
Contact
Email: ac4790@columbia.edu