Final answer:
An increased number of workers, due to factors such as immigration and increasing population, can shift the supply curve to the right. Changing demographics, policies that encourage immigration, and an aging population can also affect the supply of labor.
Step-by-step explanation:
An increased number of workers will cause the supply curve to shift to the right. An increased number of workers can be due to several factors, such as immigration, increasing population, an aging population, and changing demographics. Policies that encourage immigration will increase the supply of labor, and vice versa. Population grows when birth rates exceed death rates. This eventually increases supply of labor when the former reach working age. An aging and therefore retiring population will decrease the supply of labor. Another example of changing demographics is more women working outside of the home, which increases the supply of labor.