Indentured servitude
Like any loan, an indenture could be sold; most employers had to depend on middlemen to recruit and transport the workers, so indentures (indentured workers) were commonly bought and sold when they arrived at their destinations. Like prices of slaves, their price went up or down depending on supply and demand. When the indenture (loan) was paid off, the worker was free. Sometimes they might be given a plot of land.