RT Journal Article SR Electronic T1 The Impacts of Restricting Mobility of Skilled Service Workers JF Journal of Human Resources JO J Hum Resour FD University of Wisconsin Press SP 1025 OP 1067 DO 10.3368/jhr.55.3.0617-8840R5 VO 55 IS 3 A1 Kurt Lavetti A1 Carol Simon A1 William D. White YR 2020 UL http://jhr.uwpress.org/content/55/3/1025.abstract AB Why do skilled services firms use noncompete agreements (NCAs), which prohibit workers from leaving firms and competing against them? We conduct a survey of physicians linking NCA use to labor-market outcomes and firm performance and show that by deterring poaching of patients NCAs increase the return to job tenure, with larger effects in states with more enforceable NCA laws. These effects are consistent with NCAs enabling practices to allocate clients to new physicians through intrafirm referrals, reducing a form of investment holdup. We discuss an array of supporting suggestive evidence, but also find NCAs provide some benefits by reducing job turnover.