Research Seminars

In today's world, social media is a major source of information for many people. However, not all information on social media is accurate, and misinformation can spread quickly, especially on important topics like climate change. This study aims to examiner how social media message formats (text, picture and video) affect climate change perception and behaviours. A mixed-method study with participants from UK and Mexico was conducted. The study found that misinformation reduces the credibility of social media posts in all formats (text, picture, video). Accurate posts about climate change prompted people to think about taking action to protect the environment. In contrast, misinformation posts made some people believe that climate change is not caused by humans and therefore not their problem to fix. Finally, it was found that higher social media literacy generally helps people recognise misinformation, especially in pictures. However, surprisingly, those with higher social media literacy might find video misinformation more credible. The study significantly advances our understanding of the interplay between message formats, misinformation, and social media's impact on climate change perceptions.

Microsimulation models have become indispensable tools in evaluating the dynamic impact of policy interventions across Europe, the United States and other countries. This seminar introduces the principles and advantages of policy microsimulation, with a particular focus on the European Future Elderly Model (EUFEM).

EUFEM enables the integration of longitudinal and cross-sectional data to simulate the consequences of policy interventions in healthcare, labor markets, and social protection systems.

Drawing on results from recent applications—including disease burden estimation, LTC policies and prevention startegies—this talk illustrates how EUFEM supports policy evaluation in a controlled, data-rich environment. Particular attention will be paid to methodological choices, validation strategies, and the challenges of aligning health and economic models with real-world applications, e.g. in heart disease, diabetes, obesity and other areas.

The Paris-Lyon line is the busiest High-Speed Line in Europe and has been open to competition in open access since December 18, 2021. The main objective of the paper is to explore the effects for users with respect to price and frequency compare with the existing literature. The analysis is based on a large database (n = 1243) collected by web scraping from September 2019 to October 2022. The method relies on a descriptive analysis with a similar route without competition (Paris-Bordeaux) in the comparison group. The results highlight an increase of frequency by 15% and a decrease in price by 23%. The prices charged by the newcomer are lower than those of the incumbent (−30% to −50%). The comparison with the control route suggests a positive effect on price that moderates the economic catch-up effect following the COVID-19 pandemic in an inflationary context. More specifically, SNCF appears to take a wait and see attitude to competitive pressure from Trenitalia. It has moderated its prices since the new offer was introduced and has maintained its trains.

We examine the CEO career consequences following shareholder activism in their companies. To address endogeneity, we employ a control function approach, using expected mutual fund flow-induced sales and purchases as exclusion restrictions. We show that CEOs targeted by activists are more likely to be dismissed earlier and less likely to retain internal executive board positions than non-targeted CEOs. We also find significant decreases in their remuneration, while their outside board seats remain unaffected. These effects vary across campaign hostility, activist types, and CEOs’ ex-ante resistance. Hostile campaigns and campaigns involving hedge funds impose more adverse career effects, though anticipated CEO resistance deters activism and mitigates negative effects from hedge fund involvement in non-hostile campaigns.

The large influx of refugees over recent decades challenges many Western countries to devise effective policies for long-term integration. A key policy question is whether refugee children should be directly integrated into native schools or initially separated into migrant schools. In the Netherlands, refugee children arriving at primary-school age are taught either in integrated or separated schools depending on their randomly assigned municipality, whereas all secondary-school-aged arrivals are initially separated. We exploit this setting in a novel difference-in-differences framework, leveraging rich administrative data. Results indicate that on average, integrated primary schooling increases cultural assimilation as measured by hormonal-contraceptive usage but decreases educational outcomes at age 18. The negative educational effects are restricted to children from disadvantaged backgrounds, whereas the positive assimilation effects are strongest for children from advantaged backgrounds.