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Public Economics: Market failures and the role of government · Efficiency and the Welfare Theorems

What economists mean by efficiency, what the two welfare theorems promise about markets, and why efficiency is not the same as fairness.

Public Economics · 30 questions

Try 3 questions

1. What does it mean for an allocation to be Pareto efficient?

  1. Everyone receives an equal share
  2. Total income is as high as possible
  3. No one can gain without someone losing
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Answer: No one can gain without someone losing

Pareto efficiency means every mutually beneficial change has been exhausted: improving anyone's position would require worsening someone else's.

2. Which change counts as a Pareto improvement?

  1. One that helps a majority of people
  2. One that helps someone and hurts nobody
  3. One that raises total wealth on balance
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Answer: One that helps someone and hurts nobody

A Pareto improvement requires that no one be made worse off; gains to many cannot offset a loss to even one person.

3. If one person owns everything and wants more of it, is that allocation Pareto efficient?

  1. No, others could gain far more
  2. No, it is far too unequal
  3. Yes, any transfer would hurt the owner
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Answer: Yes, any transfer would hurt the owner

Taking anything from the owner makes them worse off, so no Pareto improvement exists; this shows efficiency alone says nothing about fairness.

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