# Questions tagged [social-choice]

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### Recursive runoff voting schemes

Background: I will below describe a generalization of the following voting systems (what is meant by “voting system” will be defined formally below) which are occasionally used in the real world: “...
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175 views

### Is there a version of Arrow's theorem without unrestricted domain?

To recall Arrow's theorem: Suppose we have a finite set $X$ of voters and a finite set $Y$ of candidates. An election is a map $\phi: X \rightarrow T$ where $T$ is the space of total orderings of $Y$. ...
• 3,934
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### Necessary and sufficient conditions for affine maps to coincide on their respective domains

Let $\mathcal{A}$ be a set of convex subsets of $\mathbb{R}^n$ and for each $A\in\mathcal{A}$ let there be an affine linear map $f_A\colon \mathbb{R}^n\rightarrow\mathbb{R}$. Moreover, assume that for ...
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### What is the fairest order for stage-striking (and is it the Thue-Morse sequence)?

Here's a fair-sequencing problem that doesn't quite match the usual fair-division problems. I think that, like those, the answer should also be the Thue-Morse sequence ("balanced alternation"), ...
• 2,535
1k views

### The Rise and Fall of Dictators & How it Depends on Our Choice

This question is loosely inspired by the following paper of Shelah on Arrow property in which he answered a question of Gil Kalai affirmatively. Shelah, Saharon, On the Arrow property. Adv. in Appl. ...
3k views

### Is there a truly general voting impossibility theorem that applies to real elections?

The purpose of most political elections is to select from the set of candidates a predetermined number $n$ of successful candidates. (Often $n = 1$.) In brief, my question is: Has it been proved ...
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1 vote
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### What does Arrow's theorem say about Kaldor-Hicks social welfare functions with von Neumann-Morgenstern utility? [closed]

Let $A$ be the set of all possible states of the world, let $G(A)$ be the set of all "lotteries" or "gambles", i.e. the set of all probability distributions over $A$. Now consider an individual with ...
• 4,181
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### Seeking a solution algorithm to the 3-partition problem

I need to divide 48 pieces of jewelry between 3 inheritors so as to give equal, or nearly equal value, to each. I have learned that this is called the 3-partition problem. I solved it for 9 pieces of ...