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A firm achieves least-cost in production by sub... - JAMB Economics 1990 Question

A firm achieves least-cost in production by substituting factors until?
A
their prices are equal
B
the ratio of their marginal -physical-products equals the ratio of their prices
C
their marginal -physical-products are each equal to their factor prices
D
their marginal -physical-products are each equal to zero
correct option: b
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