Felix uses applied econometrics to better understand the causes of social and spatial inequalities. The markets he considers key for inequality are labour, real estate, and education. He also studies expectations and (financial) decision making that contributes to long-run inequality. All of his work speaks to public debates and policy. His work got published across a wide range of outlets, including RESTUD, JOLE, RESTAT, JEEA and the EJ, among others.