<Ul> <Li> Derivation: </Li> </Ul> <Dl> <Dd> MR = ∆ TR / ∆ Q </Dd> <Dd> MP = ∆ Q / ∆ L </Dd> <Dd> MRP = MR × MP = (∆ TR / ∆ Q) × (∆ Q / ∆ L) = ∆ TR / ∆ L </Dd> </Dl> <Dd> MR = ∆ TR / ∆ Q </Dd> <Dd> MP = ∆ Q / ∆ L </Dd>

Relationship between average product and marginal product of labour