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A student of microeconomics learns that any competitive equilibrium leads to a Pareto efficient outcome (First Fundamental Theorem of Welfare Economics). What do we mean by the efficiency or inefficiency of markets?

A student of microeconomics learns that any desirable efficient market allocation can be sustained by a competitive equilibrium (the Second Theorem of Welfare Economics), given appropriate lump-sum wealth redistributions. This is typically understood as a means to correct unfair market outcomes. What are the real world implications of the second theorem? How well does it address distributional concerns?

Have economists fallen in love with an idealized vision of an economy in which rational individuals interact in perfect markets? To what extent is standard microeconomics responsible for this state of affairs?

Given the choice, would you accept to live in a society where happiness and prosperity is guaranteed for all on the condition that one single person be kept permanently unhappy? Is the well-being of thousands of people “worth” the sacrifice and suffering of a single innocent child? Such is the dilemma to which the inhabitants of the utopian city of Omelas are confronted in Ursula Le Guin’s philosophical short-story “The Ones Who Walk Away from Omelas”. In her parable, most people are ultimately able to come to terms with the atrocity. The few citizens who cannot end up walking away from the city — nobody knows where they go and they are never heard from again.