In long-run equilibrium, P 5 minimum ATC 5 MC. Of what...

In long-run equilibrium, P 5 minimum ATC 5 MC. Of
what significance for economic efficiency is the equality of P
and minimum ATC? The equality of P and MC? Distin-
guish between productive efficiency and allocative efficiency
in your answer.

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Key Concepts

Long-Run Equilibrium in Perfect Competition

In long-run equilibrium under perfect competition, firms produce where P equals both MC and minimum ATC. This situation represents a dual achievement of efficiency: firms are producing at the lowest cost possible (productive efficiency) and the output level is optimal from a consumer’s perspective (allocative efficiency).

Productive Efficiency

Productive efficiency occurs when firms produce at the lowest possible cost, which happens when they are operating at the minimum point of their average total cost (ATC) curve. In long-run equilibrium, when P equals minimum ATC, firms are not wasting resources in production and are utilizing their capacities optimally, producing goods in the most cost-effective manner.

Allocative Efficiency

Allocative efficiency is achieved when resources are distributed in a way that maximizes the net benefit to society. This condition is met when the price (P) equals the marginal cost (MC) of production. Here, the value consumers place on the last unit produced is exactly equal to the cost of resources used to make that unit, ensuring that resources are allocated to produce the mix of goods most desired by society.

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