Publications in refereed journals

"The Production of Information in an Online World" with Nicolas Hervé (INA) and Marie-Luce Viaud (INA), Review of Economic Studies, forthcoming.

News production requires investment, and competitors’ ability to appropriate a story may reduce a media’s incentives to provide original content. Yet, there is little legal protection of intellectual property rights in online news production, which raises the issue of the extent of copying online and the incentives to provide original content. In this paper, we build a unique dataset combining all the online content produced by French news media during the year 2013 with new micro audience data. We develop a topic detection algorithm that identifies each news event, trace the timeline of each story, and study news propagation. We provide new evidence on online news production. First, we document high reactivity of online media: one quarter of the news stories are reproduced online in under 4 minutes. We show that this is accompanied by substantial copying, both at the extensive and at the intensive margins, which may constitute a severe threat to the commercial viability of the news media. Next, we estimate the returns to originality in online news production. Using article-level variations and media-level daily audience combined with article-level social media statistics, we find that original content producers tend to receive more viewers, thereby mitigating the newsgathering incentive problem raised by copying.

“Media Competition, Information Provision and Political Participation: Evidence from French Local Newspapers and Elections, 1944-2014”, Journal of Public Economics, 2020, 85.

This paper investigates the impact of increased media competition on the quantity and quality of news provided and, ultimately, on political participation. I build a new county-level panel dataset of local newspaper presence, newspapers’ number of journalists, costs and revenues and political turnout in France, from 1944 to 2014. I estimate the effect of newspaper entry by comparing counties that experience entry to similar counties in the same years that do not. Both sets of counties exhibit similar trends prior to entry, but those with entry experience substantial declines in the average number of journalists. An increased number of newspapers is also associated with fewer articles and less hard news provision. Newspaper entry, and the associated decline in information provision, is ultimately found to decrease voter turnout at local elections. Exploiting the long time span covered by my data, I discuss a number of mechanisms that may drive these empirical findings. First, I examine the relationship between increased competition and media capture in the aftermath of WW2, when newspapers were biased and the advertising market was underdeveloped. I then show that in the recent period the effects are stronger in counties with more homogeneous populations, as predicted by a vertical product differentiation framework, whereas there is little impact in counties with more heterogeneous populations.

"Sex and the Mission: The Conflicting Effects of Early Christian Investments on sub-Saharan Africa's HIV Epidemic" with Valeria Rueda, Journal of Demographic Economics, forthcoming.

This article investigates the long-term impact of historical missionary activity on HIV in sub-Saharan Africa. On the one hand, missionaries were the first to invest in modern medicine in the region. On the other hand, Christianity influenced sexual beliefs and behaviors that affect the risk of contagion. We build a new geocoded dataset locating Protestant and Catholic missions in the early 20th century, as well as the health facilities they invested in, that we combine with individual-level DHS data. With these data, we can address separately these two channels, within regions close to historical missionary settlements. First, we show that proximity to historical missionary health facilities decreases the likelihood of HIV; persistence in healthcare provision and safer sexual behaviors in the region explain this result. Second, we show that regions close to historical missionary settlements exhibit higher likelihood of HIV. This effect is driven by the Christian population in our sample. This suggests conversion to Christianity as a possible explanatory channel. Our findings are robust to alternative specifications addressing selection.

"Newspapers in Times of Low Advertising Revenues" with Charles Angelucci, American Economic Journal: Microeconomics, 2019, 11(3): 319-364.

We  model  the  consequences  on  newspapers’  content  and  prices  of  a  reduction  in  advertising  revenues.  Newspapers  choose  the  size  of  their  newsroom,  and  readers  are  heterogeneous  in  their  ideal  amount  of    journalistic-intensive  content.  We  show  that  a  reduction  in  advertising  revenues  lowers  newspapers’  incentives  to  pro-duce  journalistic-intensive  content.  We  also  build  a  unique  dataset  on  French  newspapers  between  1960  and  1974  and  perform  a  difference-in-differences   analysis   exploiting   the   introduction   of   advertising on television, which affected national newspapers more severely than local ones. We find robust evidence of a decrease in the amount of  journalistic-intensive content produced and the subscription price.

"Tax Revenues and the Fiscal Cost of Trade Liberalization, 1792-2006" with Lucie Gadenne, Explorations in Economic History, 2018, 70: 1-24.

This article examines the impact of trade liberalization on government revenues. Using a new dataset on tax revenues for 130 countries between 1792 and 2006, we identify ninety-nine episodes of trade liberalization defined as a large fall in trade tax revenues not accompanied by a decrease in trade. Seven took place before World War One, seven in the interwar period, eighteen in the Bretton Woods period and the remainder after 1970. We examine the extent to which countries were able to recover the tax revenues lost by liberalizing trade by using other sources of revenue. We find that historical (pre-1970) trade liberalization episodes were unlikely to be accompanied by decreases in tax revenues, especially during the Bretton Woods era. In the recent period however, over 40% of the developing countries in our sample experience a fall in total tax revenues that lasts more than ten years after an episode of trade liberalization. Overall, trade liberalization led to larger and longer-lived declines in tax revenues in developing countries since 1970 than in today’s rich countries in the 19th and 20th centuries. Results are similar when we consider government expenditures, suggesting decreases in trade tax revenues negatively affect governments’ capacity to provide public services in many developing countries.

"Taxation, Corruption and Growth" with P. Aghion, U. Akcigit and W. Kerr, European Economic Review, 2016, 86: 24-51.

"The Long-Term Effects of the Printing Press in sub-Saharan Africa" with Valeria Rueda, American Economic Journal: Applied Economics, 2016, 8(3): 69-99.

This article investigates the long-term consequences of the printing press in the nineteenth century sub-Saharan Africa on social capital nowadays. Protestant missionaries were the first to import the printing press and to allow the indigenous population to use it. We build a new geocoded dataset locating Protestant missions in 1903. This dataset includes,  for  each  mission  station,  the  geographic  location  and  its  characteristics,  as  well  as  the  printing-,  educational-,  and  health-related investments undertaken by the mission. We show that, within regions close to missions, proximity to a printing press is associated with  higher  newspaper  readership,  trust,  education,  and  political  participation.

"Improving 'National Brands': Reputation for Quality and Export Promotion Policies" with Dorothée Rouzet, Journal of International Economics, 2015, 95(2): 274-290.

This paper studies the effect of firm and country reputation on exports when buyers cannot observe quality prior to purchase. Firm-level demand is determined by expected quality, which is driven by the dynamics of consumer learning through experience and the country of origin's reputation for quality. We show that asymmetric information can result in multiple steady-state equilibria with endogenous reputation. We identify two types of steady states: a high-quality equilibrium (HQE) and a low-quality equilibrium (LQE). In a LQE, only the lowest-quality and the highest-quality firms are active; a range of relatively high-quality firms are permanently kept out of the market by the informational friction. Countries with bad quality reputation can therefore be locked into exporting low-quality, low-cost goods. Our model delivers novel insights about the dynamic impact of trade policies. First, an export subsidy increases the steady-state average quality of exports and welfare in a LQE,but decreases both quality and welfare in a HQE. Second, there is a tax/subsidy scheme based on the duration of export experience that replicates the perfect information outcome. Third, a minimum quality standard can help an economy initially in a LQE moving to a HQE.

"Improving upon the World Bank's Country Policy and Institutional Assessment: A New Performance Indicator Based on Aid Effectiveness", Journal of Globalization and Development, 2014, 5(2): 213-233.


Le prix de la démocratie, Paris, Fayard, 2018.

English translation: Harvard University Press, 2020.
Other translations: China (The Commercial Press, forthcoming), Italy (La Nave di Teseo, 2020), Spain (Grano de Sal), Taiwan (China Times Publishing Company, forthcoming).
The book was awarded a “Prix Ethique” by Anticor, an association that combats corruption and helps restore ethics in politics. 
The book was awarded the 8th edition of the “Prix Pétrarque de l’Essai France Culture-Le Monde”.

L’information à tout prix, with Nicolas Hervé and Marie-Luce Viaud. Paris, Institut National de l’Audiovisuel, 2017.

Other translations: China (CITIC Press Corporation), Germany (BECK Verlag), Italy (Bompiani), Japan (Tokuma Shoten), Korea (Geulhangari Publishers), Portugal (Temas e debates), Romania (, Serbia (Akademska Knjiga), Spain (Anagrama), Turkey (Kültür).

The book was awarded the Special Jury Prize for Best Book on Media of the 2016 edition of the “Prix des Assises du Journalisme”.

Chapters in books & White papers

"Protecting Journalism in the Age of Digital Platforms" (with J. Gans, E. Goodman, B. Knight, A. Prat, G. Rolnik, and A. Schiffrin), 2019. Stigler Center for the Study of the Economy and the State (University of Chicago Booth School of Business).

"From Philanthropy to Democracy: Rethinking Governance and Funding of High-Quality News in the Digital Age". In: Digital Technologies and Democratic Theory (forthcoming), Lucy Bernholz, Landemore, Hélène and Reich, Rob.

"The Devil is in the Detail: Christian Missions’ Heterogeneous Effects on Development in sub-Saharan Africa" (with Valeria Rueda). In: The Long Economic and Political Shadow of History (2017), Stelios Michalopoulos and Papaioannou, Elias, p.98-109. CEPR Press (VOX eBook).

"The Economics of the African Media". In: The Oxford Handbook of Africa and Economics (2015), Célestin Mongan and Lin, Justin, p. 605-625. Oxford: Oxford University Press.

"Measuring Policy Performance: Can we do Better than the World Bank?". In: Industrial Policy and Economic Transformation in Africa (2015), Akbar Noman and Stiglitz, Joseph, p. 268-292. Columbia: Columbia University Press.

Research Papers

“Heroes and Villains: The Effects of Combat Heroism on Autocratic Values and Nazi Collaboration in France” with Anna Dagorret (Paris School of Economics), Saumitra Jha (Stanford University), and Pauline Grosjean (UNSW Business School)

To what extent can heroes coordinate and legitimize otherwise strongly-proscribed and potentially repugnant political behavior? In this paper, we exploit the purposefully arbitrary Noria rotation of French regiments to measure the legitimizing effects of heroic human capital, gleaned through exposure to the pivotal Battle of Verdun under General Philippe Pétain in 1916. We wed this with a unique newly declassified dataset of 97,242 individual collaborators with the Nazis collected by French army intelligence in 1945 to show that, during the Pétain-led Vichy regime (1940-44), municipalities that raised troops that served under Pétain at Verdun later housed more collaborators with the Nazis than otherwise similar municipalities. Individuals from these municipalities were 5% more likely to join Fascist political parties or paramilitary groups that conducted the internal repression of the regime against Jews and resistants, or to directly join German military units. We interpret these results as reflecting the role that Verdun played in generating both credentials for leadership and organizational capacity that legitimized otherwise proscribed values, forging political identities that proved durable in explaining the Left-Right divide in France throughout much of the post-war period, and that were particularly salient in times of social and political crisis.

This paper received the Oliver Williamson Best Conference Paper Award, for the best paper delivered at the SIOE (Society for Institutional & Organizational Economics) 2020 Conference.

"The Heterogeneous Price of a Vote: Evidence from Multiparty Systems, 1993-2017" with Yasmine Bekkouche (Université Libre de Bruxelles) and Edgard Dewitte (Sciences Po Paris).

What is the impact of campaign spending on votes? Does it vary across election types, political parties or electoral settings? Estimating these effects requires comprehensive data on spending across candidates, parties and elections, as well as identification strategies that handle the endogenous and strategic nature of campaign spending in multiparty systems. This paper provides novel contributions in both of these areas. We build a new comprehensive dataset of all French legislative and UK general elections over the 1993-2017 period. We propose new empirical specifications, including a new instrument which relies on the fact that candidates are differentially affected by regulation on the source of funding on which they depend the most. We find that an increase in spending per voter consistently improves candidates’ vote share, both at British and French elections, and that the effect is heterogeneous depending on the party. In particular, we show that spending by far-right candidates has much lower returns than spending by other parties, and that this can be partly explained by the social stigma attached to far-right voting. Our findings help reconcile the conflicting results of the existing literature, and improve our understanding of why campaigns matter.

CEPR Discussion Paper #15150

Media coverage: Le MondeInstitute for New Economic ThinkingVOX (previous version with only France: CEPR Discussion Paper #12614)

“Media Competition and News Diets” with Charles Angelucci (Columbia University) and Michael Sinkinson (Yale University)

News media operate in two-sided markets, offering bundles of content to readers as well as selling readers’ attention to advertisers. Technological innovations in content delivery, such as the advent of broadcast television or of the Internet, affect both sides of the market, threatening the basic economic model of print news operations. We examine how the entry of television affected local newspapers as well as consumer media diets in the United States. We develop a model of print media and show that entry of national television news could adversely affect the provision of local news. We construct a novel dataset of U.S. newspapers’ economic performance and content choices from 1944 to 1964. Our empirical strategy exploits quasi-random variation in the timing of the entry of television in different markets. We show that the entry of television was a negative shock for newspapers, particularly evening newspapers, in both the readership and advertising markets. Further, we find a drop in the total quantity of news printed, in particular original reporting, raising concerns about the provision of local news.

"Social Media and Newsroom Production Decisions" with Nicolas Hervé (INA) and Béatrice Mazoyer (INA)

Social media affects not only the way we consume news, but also the way news is produced, including by traditional media outlets. In this paper, we study the propagation of information on social media and mainstream media, and investigate whether news editors are influenced in their editorial decisions by stories popularity on social media. To do so, we build a novel dataset including a representative sample of all tweets produced in French between July 2018 and July 2019 (1.8 billion tweets, around 70% of all tweets in French during the period) and the content published online by about 200 mainstream media during the same time period, and develop novel algorithms to identify and link events on social and mainstream media. To isolate the causal impact of popularity, we rely on the structure of the Twitter network and propose a new instrument based on the interaction between measures of user centrality and news pressure at the time of the event. We show that story popularity has a positive effect on media coverage, and that this effect varies depending on media outlets’ characteristics. These findings shed a new light on our understanding of how editors decide on the coverage for stories.

"It Takes Money to Make MPs : New Evidence from 150 Years of British Campaign Spending" with Edgard Dewitte (Sciences Po Paris) (Draft coming soon)

What is the price of a vote and how did it evolve over time? In this paper, we study the impact of campaign spending on electoral results in the United Kingdom over the last 150 years, a period that covers the emergence of different campaigning technologies. We build a new exhaustive dataset on campaign spending and votes since 1857, including not only detailed election expenses for 62,248 election-constituency-candidates, but also extensive candidates’ characteristics as well as constituency-level controls. Beyond this important data collection effort, our contribution to the literature is threefold. First, we propose two new instruments based on historical events to estimate the causal impact of spending on votes. Second, we investigate whether the introduction of new campaigning technologies has affected the relationship between spending and votes. Finally, we exploit the multiparty nature of the U.K. electoral data and examine whether the efficiency of campaign spending varies depending on the political parties. We show that there is a positive effect of spending on votes, and that this effect is becoming stronger over time, reflecting an higher efficiency of new campaigning technologies. Furthermore, we document that while historically, campaign expenditures were relatively less efficient for the UK Independence Party, there is a convergence over time. This may reflect a decrease in the stigma associated with the UKIP vote, and help to improve our understanding of the determinants of the rise of right-wing populism.

"Charismatic Leaders and the Future of Nations: Verdun, Pétain, and Political Extremism in France, 1932-2017" with Anna Dagorret (Paris School of Economics), Saumitra Jha (Stanford University), and Pauline Grosjean (UNSW Business School) (Draft coming soon)

Do individual leaders shape historical outcomes? Using electoral results for local elections in France since the eve of WWII, this paper documents how collaboration activities shaped post-war political outcomes. Uniquely in the literature, we were able to access and have digitized a newly declassified dataset on all the 90,000 individuals that had been considered as collaborators during the war. We combine these data with local-level electoral results of all the legislative elections since 1932 and document how war-time political cleavages and violence shaped voting behavior and political identities. We propose a new instrument for the intensity of Collaboration at the local level: the “Noria” (rotation) system used by General Pétain to relieve French troops during the Battle of Verdun in 1916. We find that this exogenous exposure to the “victor of Verdun” is an important driver of Collaboration. The instrumented intensity of Collaboration at the local level is then find to have a positive and persistent causal effect on the vote for the far right.

Work in Progress

“Why Not Me? 100 years of Political Selection and Strategic Allocation in the UK” with Edgard Dewitte (Sciences Po Paris).

“Money and Ideology: Evidence from French Legislative elections” with Caroline Le Pennec-Çaldichoury (Berkeley) and Elisa Mougin (Sciences Po Paris).

“Payroll and Inequality within the Newsroom: Evidence from France, 1936-2016”

“Estimating the Production and Demand for Online News: Micro-Level Evidence from the Universe of French News Media” with Nicolas Hervé (INA) and Marie-Luce Viaud (INA)

“Democratization and Media Supply: Evidence from India” with Guilhem Cassan (University of Namur) and Francesca Jensenius (Norwegian Institute of International Affairs)

“Word Embeddings for Topic Detection and Tracking” with Béatrice Mazoyer (INA), Nicolas Hervé (INA), Marc Evrard (INA) and Céline Hudelot (Ecole Centrale Paris).

Publications in Computer Sciences

"A French Corpus for Event Detection on Twitter" with B. Mazoyer, N. Hervé and C. Hudelot, Proceedings of the 12th Conference on Language Resources and Evaluation (LREC 2020).

“Représentations lexicales pour la détection non supervisée d’événements dans un flux de tweets : étude sur des corpus français et anglais” with B. Mazoyer, N. Hervé and C. Hudelot, Extraction et Gestion des Connaissances (EGC 2020).

Dans cet article, nous nous intéressons aux approches récentes de plongements lexicaux en vue de les appliquer à la détection automatique d’événements dans un flux de tweets. Nous modélisons cette tâche comme un problème de clustering dynamique. Nos expériences sont menées sur un corpus de tweets en anglais accessible publiquement ainsi que sur un jeu de données similaire en français annoté par notre équipe. Nous montrons que les techniques récentes fondées sur des réseaux de neurones profonds (ELMo, Universal Sentence Encoder, BERT, SBERT), bien que prometteuses sur de nombreuses applications, sont peu adaptées pour cette tâche, même sur le corpus en anglais. Nous expérimentons également différents types de fine-tuning afin d’améliorer les résultats de ces modèles sur les données en français. Nous proposons en- fin une analyse fine des résultats obtenus montrant la supériorité des approches traditionnelles de type tf-idf pour ce type de tâche et de corpus.

“Real-Time Collection of Reliable and Representative Tweets Datasets Related to News Events” with B. Mazoyer, C. Hudelot and M.-L. Viaud, Proceedings of the First International Workshop on Analysis of Broad Dynamic Topics over Social Media (BroDyn 2018) co-located with the 40th European Conference on Information Retrieval (ECIR 2018), 2018, 23–34.

Unpublished articles and “oldies”

"Asymmetric Information, Rent Extraction and Aid Efficiency", 2009.

Official Development Aid flows are volatile, non-predictable and not delivered in a transparent way. All these features reinforce asymmetric information between the citizens and the recipient government about the amount of aid flows received by developing countries. This article uses a political economy model of rent extraction to show how this asymmetry (i) encourages rent extraction by kleptocratic regimes, thus reducing aid efficiency, and (ii) increases the negative impact of aid volatility. It identifies a new channel - the "asymmetric information" channel - through which aid volatility is costly for recipient countries. The empirical relevance of the model is confirmed on a panel data of developing countries. Using various specifications and econometric methods, and developing new yearly estimates of aid volatility, I show that (i) introducing more information increases aid efficiency, that (ii) the negative impact of aid volatility on aid efficiency vanishes once one controls for information, and that (iii) this positive impact of information does not come from the fact that more transparent countries tend to have better institutions.

"Aid Volatility and Macro Risks in Low-Income Countries" with Eduardo Borensztein, Daniel Cohen and Cécile Valadier, OECD Development Centre 273, 2008.

Non-academic Publications

See the dedicated page