Hi! My name is Marijn
I’m a Research Fellow at the Institute for Advanced Study in Toulouse, University of Toulouse 1 Capitole, in France (IAST).
My main research interests are in computational social science and complexity science. Specifically, theoretical and empirical modeling of online behavior and digital trace data. In my PhD research I focused on the impact of communicating via online social media platforms on processes of opinion formation and the diffusion of culture. Currently, I am working on the effects of network embeddedness, environmental bias and politicization of decision making on the emergence of polarization.
I got my PhD in Sociology from the University of Groningen where I was a member of the Norms and Networks Cluster and the ICS. Before joining the IAST, I was a Postdoctoral researcher at the Chair of Sociology and Computational Social Science in the Karslruhe Institute of Technology.
Let’s get in touch: marijn.keijzer@iast.fr
Updates
February 2023 \\ This summer I am organizing two events
at Constructor University in Bremen (Germany). First up, there will be a
BIGSSS Summer School in Computational
Social Science on Modeling Opinion Dynamics and Democratic
Decisions. The school is also a research incubator, where teams of
young scholars and experts work together on a research project. Join us
as an expert (call for experts here)
or participant July 3-12. Calls and all other info on our website.
Connecting
seamlessly, we then organize the second edition of the Interdisciplinary Workshop on Opinion
Dynamics and Collective Decision on July 12-14. The workshop brings
together researchers who study theoretical and empirical modeling of
opinion dynamics. More information can be found on the workshop website. Both events are
co-organized with Jan Lorenz and Bruce Edmonds. Hope to see you in
Bremen!
December 2022 \\ A high socioeconomic status converts
to hard cash for sellers on peer2peer market places. With Rense Corten, I tested the
positive link between SES and trust – hypothesized by James Coleman a
lifetime ago. In a vignette experiment, we asked respondents which of a
set of sellers they preferred, and consistently, they chose to buy from
high status sellers. Even when the high SES seller offered the product
at a higher price. The study has interesting real-world implications.
The profiles that peer to peer marketplaces use all the time might
contain information that amplifies existing inequalities between users.
Seemingly small decisions on what to contain in those profiles matter.
The paper Socioeconomic status,
reputation, and interpersonal trust in peer-to-peer markets: Evidence
from an online experiment is published, open access, in Rationality
& Society—A journal founded by… James Coleman
Website was last updated on February 24, 2023