Concept:The backward bending supply curve of labour shows a special case where the supply of labour falls after a certain wage level.
Explanation:At lower wage rates, the supply curve slopes upward because higher wages attract more workers.
Beyond a certain wage, workers prefer more leisure instead of extra work.
This happens because the income effect becomes stronger than the substitution effect.
The curve thus bends backward, meaning labour supply and wage are not directly related at all wage levels.
So it does not follow the normal law of supply.
Therefore, it represents an abnormal supply situation.
Answer:A. an abnormal supply situation