Upward sloping refers to a positive relationship between two variables. In this context, it means that as wages rise, the quantity of labor supplied also increases.
Related terms
Demand curve: A graphical representation showing the relationship between price and quantity demanded.
Elasticity: A measure of responsiveness or sensitivity when there is a change in one variable relative to another variable.
Law of supply: The principle that states that as prices rise, producers are willing to produce and sell more output.