Johannes is Assistant Professor at CORE and the Université catholique de Louvain. He is a researcher primarily working in behavioral economics and industrial organization, and more generally in applied microeconomic theory. The starting point of his research in behavioral economics and industrial organization is that consumers often make costly mistakes, either by misperceiving their own behavior or by misunderstanding product features. Firms respond in their product design to these mistakes and existing research has shown that some biases are mitigated in markets while others are amplified. It is therefore important to understand the interaction of consumer mistakes and firms to decide when interventions are appropriate and to design policies on education, consumer protection, or rules on data usage in order to make sure that markets work despite consumer mistakes.