Because there are costs to migration,

A) complete wage equalization is unlikely to occur, even if national governments impose no restrictions on migration.
B) migrants are more likely to move to countries far from their origin nation.
C) migrant and domestic-born workers are unlikely to be substitute resources.
D) wage equalization will only occur if migrant and domestic-born workers are complementary resources.

Wage Equalization

The theory or goal of aligning wages for similar work across different regions or sectors to minimize inequality.

Migration Costs

Expenses and losses associated with moving from one location to another, often considered in the context of labor mobility or relocation.

Substitute Resources

Alternate resources or inputs that can be used in place of one another in the production process, often leading to competition between them.