RT Journal Article SR Electronic T1 Spillover bias in multigenerational income regressions JF Journal of Human Resources JO J Hum Resour FD University of Wisconsin Press SP 0520-10919R2 DO 10.3368/jhr.0520-10919R2 A1 Modalsli, Jørgen A1 Vosters, Kelly YR 2022 UL http://jhr.uwpress.org/content/early/2022/01/31/jhr.0520-10919R2.abstract AB A growing literature studies long-term income persistence across more than two generations. Despite a rich understanding of measurement-related biases for the parentchild model, far less is known for the multigenerational model that captures transmission from parents and grandparents. We show that even using a 25-year income average can result in a spurious grandparent coefficients. Importantly, for a given parental measure, averaging over more years for grandparents increases spillover bias. We propose an IV approach that can more effectively mitigate bias with shorter timespans of income. With Norwegian administrative data, we reveal a positive spillover bias in the grandfather coefficients.