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From prison peers to co-offenders

Author

Listed:
  • Julian Vedeler Johnsen

    (UiB - University of Bergen)

  • Laura Khoury

    (LEDa - Laboratoire d'Economie de Dauphine - IRD - Institut de Recherche pour le Développement - Université Paris Dauphine-PSL - PSL - Université Paris Sciences et Lettres - CNRS - Centre National de la Recherche Scientifique)

Abstract

This paper provides direct evidence that shared incarceration can facilitate the formation of post-release criminal partnerships. Using Norwegian administrative data linking prison spells to police case identifiers, we measure network ties through subsequent co-offending. We exploit time-based variation in exposure within facilities by comparing inmate pairs in the same facility who differ only in whether their spells overlapped. Overlap is associated with a 37% increase in five-year co-offending relative to comparable non-overlapping pairs, robust to extensive controls and timing-based restrictions. Effects are stronger in environments and for pairs where interaction is plausibly more intense, highlighting network formation as a plausible mechanism.

Suggested Citation

  • Julian Vedeler Johnsen & Laura Khoury, 2026. "From prison peers to co-offenders," Post-Print hal-05726614, HAL.
    • Handle: RePEc:hal:journl:hal-05726614
    DOI: 10.1016/j.jpubeco.2026.105756
    Note: View the original document on HAL open archive server: https://hal.science/hal-05726614v1
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