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Keeping all other inputs constant, when a firm changes the labour from 3 to 4, the total product changes from 40 to 50. What is the marginal product of the 4th unit of labour?

Solution

✅ Correct Option: 3

Marginal product of the nth unit of labour =TPn−TPn−1= TP_n - TP_{n-1}.

MP4=TP4−TP3=50−40=10MP_4 = TP_4 - TP_3 = 50 - 40 = 10 units.

Hence the marginal product of the 4th unit of labour is 10 units.

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