Final answer:
An increase in the value placed on leisure by workers is most likely to reduce the supply of labor.
Step-by-step explanation:
An increase in the value placed on leisure by workers is most likely to reduce the supply of labor. When workers value leisure more highly, they are less willing to work and forego leisure activities, resulting in a decrease in the supply of labor.
For example, if workers have the option to work fewer hours and spend more time on leisure activities, they may choose to reduce their labor supply.