Those individuals with high market wage, tend to spend less time in nonmarket activities. In utility maximization, individuals will spend time doing nonmarket work if they feel they can produce goods and services more cheaply than the market can. There is a substitution effect and an income effect with respect to wages and quantity supply of labor. As wages increase, you substitute market work in place of other things. This is the substitution effect of a wage increase.
Leisure is a normal good so as income rises, leisure increases.
As wage increases and therefore income increases, leisure consumption increases which reduces labor supplied. As wage increases, the substitution effect causes you to increase your quantity of labor supplied to market work. As wage increases, the income effect causes you to decrease your quantity of labor supplied to market work. Up to a certain wage, the substitution effect is in command. Once you reach a certain wage that is critical to the individual, the income effect takes over and quantity of labor supplied begins to fall.