Cs294-1 Algorithmic Aspects of Game Theory 4.1 Overview 4.2 Social Choice Theory
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چکیده
• Dictatorship: ( 1, . . . , n) = 1 • Democracy: When |C| = 2, c1 ( 1, . . . , n) c2 iff |{i : c1 i c2}| ≥ |{i : c2 i c1}|. Theorem 4.3. When |C| = 2, majority voting is the only social welfare functional that is monotone (an agent’s preference change from c1 to c2 does not cause the global preference to change from c2 to c1) and symmetric with respect to agents (permuting the agents does not change the result) and outcomes (reversing the role of the two choices in the input results in the same reversal in the output).
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