Sutter, Matthias Max Planck Institute for Research on Collective Goods, Max Planck Society;
http://www.coll.mpg.de/pdf_dat/2019_03online.pdf (Any fulltext)
Kerschbamer, R., Neururer, D., & Sutter, M. (2019). Credence goods markets and the informational value of new media: A natural field experiment.