The Career Cost of a Border, Measured Carefully

Moving states can stall a career when a worker reaches a new labor market with an occupation that is less portable than their underlying skill. The strongest conclusion from the evidence is conditional: a state-specific licensing rule can reduce interstate mobility for some occupations and some long-distance moves, but overall state licensing rates do not appear to be a dominant explanation for the volume of migration between states. To understand the difference, keep three things together—credential transfer, local career capital, and ordinary relocation costs—and keep the scale of the claim matched to the evidence.

This conclusion is less dramatic than “licenses stop people from moving,” but it is more useful. It explains why a worker can face a genuine career obstacle even when national migration statistics show little licensing effect. It also explains why a reform that helps a teacher, pharmacist, lawyer, or electrician may be worthwhile without solving the broader decline in interstate mobility.

A border matters at the junction of credential and labor market

The central mechanism is a junction, not a single barrier. A worker first evaluates the destination opportunity against the ordinary cost of moving a household. They then ask whether the occupation can be practiced there under the destination state's rules. Finally, they face the economic work of entering a new labor market: rebuilding clients, reputation, seniority, employer relationships, or local knowledge where those assets matter.

A credential can fail to travel at any of these junctions. A state-specific exam can delay legal practice even when an employer wants to hire the worker. A license may transfer but not restore the local clientele that made the old practice profitable. A credential may be fully recognized and still not justify a move because housing, family ties, or the destination's job prospects make the overall return unattractive. The presence of a license does not tell us which junction is binding.

The individual-level evidence is most relevant to the second junction. Johnson and Kleiner compare state-specific licensed occupations with quasi-national licensed occupations among people who have already made a long move, and in their preferred sample among people who lived outside their state of birth in the previous year. This design reduces the influence of people who never consider a substantial move and of a simple preference to remain in one's home state. Under the study's assumptions, state-specific occupations cross state lines at about a 7 percent lower rate than the comparison occupations.

That estimate is neither trivial nor universal. It is large enough to matter when a worker and an employer are deciding whether a particular opportunity can begin on time. It is small enough that many workers in the affected occupations still move, and it does not identify the reason for every individual decision. It is a relative likelihood among a selected group, not a prediction for all licensed workers or all residential moves.

The occupation-specific results make the conditional nature clearer. In the preferred long-distance sample, the clearest reductions appear for teachers, pest-control workers, electricians, pharmacists, and lawyers. The largest reported effects are about 16 percent for pharmacists and 14 percent for pest-control workers; other affected occupations are around 7 percent lower. Several state-specific occupations do not show a statistically significant difference. The estimate therefore describes a pattern of uneven exposure, not a property shared equally by every occupation whose exam varies across states.

The differences can arise from the interaction of formal and informal career assets. A pharmacist may encounter a state jurisprudence exam even when the rest of the job is organized through a large employer. A teacher may bring subject knowledge but lose district-specific seniority and benefits. A lawyer may carry professional training into a new state but confront both a bar exam and a practice built around local law. These cases share a state-based licensing issue while differing in the amount and type of local capital at stake.

The data also leave open a more serious form of career interruption.