A shift in the market demand for labor occurs when the number of workers that employers wish to hire changes at any wage level. Such changes in demand can occur due to factors other than wage changes. Examples include product price changes and technological advancements in production processes.

A rightward shift in the labor demand curve means employers want to hire more workers at each wage level, while a leftward shift indicates they want to hire fewer workers at each wage level.

Technological changes are a key factor influencing shifts in labor demand. The direction of the shift depends on whether the technology complements labor or substitutes for it.

Labor-augmenting technology, such as computer-aided design (CAD) software, is a complement to labor that enhances worker productivity, enabling them to produce more output in the same amount of time. This increase in productivity increases the value of the marginal product of labor (VMPL) and shifts the labor demand curve to the right. Additionally, there may be new uses for labor. For example, there is increased demand for specialized skills to maintain and repair advanced software and hardware systems.

In contrast, labor-displacing technologies, such as advanced automation systems, substitute for human labor by performing tasks previously carried out by workers. This substitution reduces the value of the marginal product of labor (VMPL), which decreases the demand for labor at all wage levels and shifts the labor demand curve to the left.