Allocative efficiency

It is possible to produce things superbly and still produce the wrong things. Allocative efficiency is about producing what people actually want most.

Allocative efficiency is achieved when an economy's resources are directed to producing the goods and services that people value most, in the right quantities. It is efficiency in what is produced, as distinct from how cheaply it is produced.

Producing the right things

The idea pins down a precise condition: resources are allocated efficiently when, for each good, the value to consumers of the last unit produced equals the cost of producing it, that is, when price equals marginal cost. At that point, no reshuffling of production could create more value, because anything worth more than it costs is already being made, and nothing costing more than it is worth is. Produce too little of something people value and there is unmet value; produce too much and resources are wasted on what is worth less than its cost.

Why markets can reach it, and fail to

Competitive markets tend toward allocative efficiency because prices signal what people value and guide resources accordingly; firms produce more of what commands a price above cost and less of what does not. But the result holds only under demanding conditions. Monopoly restricts output below the efficient level to keep prices high; externalities mean prices ignore costs or benefits falling on others; public goods are undersupplied. Each is a way an economy can produce the wrong mix even while each producer is individually efficient.

Efficient production of the wrong thing

The concept's sharpest lesson is the gap between doing things right and doing the right things. A factory can be a model of productive efficiency, lowest possible cost, and still be allocatively inefficient if it is making something society values less than what those resources could otherwise produce. Both forms of efficiency matter, and they are not the same.

Allocative efficiency is the standard by which economists judge whether a market is producing the right things in the right amounts, and the lens through which monopoly, externalities, and other market failures are seen as failures: not of effort or cost, but of directing resources to what people most want.