Ask whose skills complement each other and where constraints remain.
Labour inflows can ease shortages, support output and add specialised skills. Migrants also consume goods and services, so labour demand and aggregate demand need not stay fixed. Effects on existing workers depend on whether skills are substitutes or complements, firms' investment responses and the time available to adjust. Some workers may face wage pressure while complementary occupations gain. Infrastructure, housing and public services may need expansion. In source countries, outward migration can reduce particular skill supplies but also generate remittances, overseas networks and returning expertise. Assess both countries and the migrants themselves rather than assuming a single effect for every worker.
- Destination economy
- Migrants can ease shortages and bring skills, but also need housing and services. They buy goods and services too, so both labour supply and demand can change.
- Source economy
- Remittances are money migrants send home. Brain drain is the loss of skilled people who leave. A source country can receive remittances while still losing nurses or other staff it needs.
- Different skills
- Substitutes can do similar work and compete for jobs. Complements work together, so more of one skill can raise demand for another. Effects on wages differ across occupations and over time.
Use a conditional labour-market analysis
Substitutes
An inflow of workers with similar skills can put downward pressure on that occupation's wage if demand and other conditions stay fixed.
Complements
Additional specialised workers can raise the productivity of others and encourage expansion, increasing demand for complementary jobs.
Receiving and sending societies
Assess housing/services, remittances, skill shortages, returning knowledge and migrants' own gains and costs; avoid treating one country's GDP as the complete welfare test.
Worked example: Recruiting nurses while housing adjusts
A region recruits nurses from abroad while expanding clinics. Existing nurses face heavy workloads, but housing capacity is slow to increase. The source region also has shortages in some hospitals.
- More qualified nurses can ease the destination's service bottleneck and complement other healthcare workers.
- The wage and employment effect depends on staffing demand, substitutability and expansion, not labour supply alone.
- Slow housing adjustment can create costs that need planning and funding.
- The source region can receive remittances yet lose needed skills; compare these effects rather than declaring migration wholly beneficial or harmful.
Watch out for this
More migrant workers must reduce every existing worker's wage.
Complementary skills, demand expansion and investment can change labour demand; outcomes differ across occupations and over time.
Check your understanding
Which makes a simple fixed-demand wage prediction unreliable?
- All migrants have exactly the same skills as all residents.
- New skills help firms expand and increase demand for complementary workers.
- Every wage is unaffected by supply conditions.