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By the end of these notes, you should be able to:
Before we talk about when markets work well or badly, we first need to understand what it means for a market — or an economy — to be efficient. In economics, efficiency is about getting the most out of the resources available. There are two main types of efficiency you need to know.
Productive efficiency means producing goods and services at the lowest possible cost. In other words, a firm or economy is productively efficient when it is not wasting any resources — it is getting the maximum possible output from every input it uses.
Think of it this way: imagine a factory that makes shoes. If the factory is productively efficient, it is making shoes using the least amount of labour, materials, and machinery possible for that level of output. There is no waste. No worker is sitting idle. No raw materials are being thrown away unnecessarily.
Simple definition: Productive efficiency occurs when output is produced at the lowest average cost possible — no resources are wasted.
Allocative efficiency is about making sure the right goods and services are being produced in the right quantities — based on what consumers actually want.
Consumers show what they want through the prices they are willing to pay. If consumers really want a good, they are willing to pay a high price for it. For the economy to be allocatively efficient, resources must be directed towards producing what consumers value most.
In economics, we express this condition using a specific rule:
Allocative efficiency occurs when Price (P) = Marginal Cost (MC)
Let's break down what this means:
When P = MC, the value consumers get from the last unit produced is exactly equal to the cost of producing it. This means society's resources are being used in the best possible way — producing exactly what people want at exactly the right quantities.
If P > MC, the good is being underproduced — consumers want more of it than is being made. If P < MC, the good is being overproduced — too many resources are being used on something people do not value highly enough.
Simple definition: Allocative efficiency occurs when goods and services are produced in the quantities that best match what consumers want — specifically when P = MC.
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