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By Wulf Gaertner

This introductory textual content explores the speculation of social selection. Written as a primer compatible for complex undergraduates and graduates, this article is going to act as a major place to begin for college students grappling with the complexities of social selection idea. Rigorous but available, this primer avoids using technical language and offers an up to date dialogue of this swiftly constructing box. this can be the 1st in a chain of texts released in organization with the LSE.

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Extra info for A Primer in Social Choice Theory (LSE Perspectives in Economic Analysis)

Example text

Conditions U , I and PI have very strong implications for F . Sen (1977b) has shown that the three conditions together imposed on F are equivalent to a property called strong neutrality. Strong neutrality requires that the social evaluation functional F ignore all non-utility information with respect to the alternatives, such as names or rights or claims or procedural aspects. The only information that counts is the vector of individual utilities associated with any social alternative. This ‘fact’ has been termed ‘welfarism’ in the literature of social choice theory as well as bargaining theory (we briefly discussed this issue in our introduction) and has been sharply criticized from different angles.

The reader should note two points. The first refers to the profile that we have used above. It has the structure of the so-called paradox of voting to which we shall come back in the next chapter. The second refers to the fact that the preferences of the individuals in V3 are not needed in our argumentation. In other words, we could have dispensed with a part of the profile of the voting paradox. It would, perhaps, be a good exercise for the reader to check that the last statement actually holds. 3.

Positive responsiveness now requires that g (d1 , . . , dn ) = +1. The last step is by mathematical induction. Suppose that N (1) = N (−1)+m implies g (d1 , . . , dn ) = +1. We have to prove that N (1) = N (−1) + (m + 1) implies g (d1 , . . , dn ) = +1. Therefore, suppose that N (1) = N (−1) + (m + 1). Again, there is at least one di = +1 in the profile (d1 , . . , dn ). We consider another profile (d1 , . . , dn ) with di = di for i = k and dk = 0. For the latter profile, we have N (1) = N (−1) + m and from induction g (d1 , .

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