Economics 9708/33 — May/June 2019

Background Concept

Economic efficiency is a normative concept used to judge how well an economy allocates its scarce resources. The most precise definition used in economics is Pareto efficiency (or Pareto optimality). A situation is Pareto efficient if no reallocation of resources can make at least one person better off without making someone else worse off. Conversely, a situation is Pareto inefficient if such a reallocation IS possible — that is, there exists a 'win-win' change that improves someone's welfare without harming anyone. This is the core idea tested here.

It is crucial to distinguish efficiency from equity (fairness). A Pareto-efficient outcome can be highly unequal; efficiency is about the size of the 'pie', not how it is sliced.

Understanding the Question

The question asks: "When can an economy be said to be economically inefficient?" It is a direct test of the definition of Pareto efficiency. The four options present different scenarios; only one correctly describes the condition for inefficiency.

Approach

1. Recall the definition of Pareto efficiency.
2. Invert it to get the definition of Pareto inefficiency.
3. Match that inverted definition to one of the four options.
4. Eliminate the other options by identifying what economic concept they actually describe (equity, government size, inflation).

Step-by-Step Reasoning

• Step 1: Define Pareto efficiency. An allocation is Pareto efficient if no reallocation can make someone better off without making someone else worse off.
• Step 2: Derive the condition for inefficiency. If an allocation is NOT Pareto efficient, then there EXISTS some reallocation that can make at least one person better off without harming anyone else. This is exactly what option A says: "when it is possible to make some people better off without making other people worse off."
• Step 3: Eliminate the other options.
  • Option B describes an inequitable distribution of income. An economy can be efficient (Pareto optimal) yet have a very unequal distribution. Equity and efficiency are separate criteria.
  • Option C describes a change in the composition of output between the public and private sectors. This is a structural change, not a definition of inefficiency. A growing government sector could be efficient or inefficient depending on the circumstances.
  • Option D describes a situation where wage growth outpaces productivity growth. This is a macroeconomic imbalance that may lead to inflation, but it is not a definition of economic inefficiency in the allocative sense.

Key Takeaways

• The precise definition of Pareto efficiency is the benchmark for economic efficiency in microeconomics.
• Inefficiency is the existence of a 'free lunch' — a change that helps someone without hurting anyone.
• Efficiency and equity are distinct concepts; an efficient outcome can be unfair, and a fair outcome can be inefficient.
• Multiple-choice questions on definitions reward precise recall, not general understanding.

Common Mistakes

• Confusing efficiency with equity: choosing B because an unequal distribution 'feels' inefficient.
• Confusing efficiency with macroeconomic stability: choosing D because rising wages without productivity growth seems 'wasteful'.
• Misreading the question: the question asks for the condition of inefficiency, not efficiency. A student who knows the definition of Pareto efficiency might mistakenly pick the opposite of option A.

Things to Be Careful About

• Read the question stem carefully: "When can an economy be said to be economically inefficient?" — it asks for the condition of inefficiency.
• Know the exact wording of the Pareto criterion. The exam often tests the precise phrasing.
• Do not overthink. This is a 1-mark definition question; the answer is the direct application of the definition.