Exceptional Supply Curve or Backward bending Labour Supply Curve:

As per the law of supply, when price increases, the supply also increases and vice versa. But for certain commodities as price increases the supply decreases. For example, after a certain level of wage rate, the increase in the wage rate will not increase labour supply as people prefer leisure overwork and those who are already working at lower wage rates may stop going for work.

Fig: Backward bending labour supply curve