Difference between revisions of "Aumann's agreement theorem"

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'''Aumann's agreement theorem''', roughly speaking, says that two agents acting rationally (in a certain precise sense) and with [[common knowledge]] of each other's beliefs cannot agree to disagree. More specifically, if two people are genuine [[Bayesian]]s, share common [[priors]], and have common knowledge of each other's current probability assignments, then they must have equal probability assignments.
 
'''Aumann's agreement theorem''', roughly speaking, says that two agents acting rationally (in a certain precise sense) and with [[common knowledge]] of each other's beliefs cannot agree to disagree. More specifically, if two people are genuine [[Bayesian]]s, share common [[priors]], and have common knowledge of each other's current probability assignments, then they must have equal probability assignments.
 
Outside of well-functioning [[prediction market]]s, Aumann's conditions can probably only be reached by careful [[deliberation|deliberative discourse]]: whether deliberation tends to resolve disagreements in practice is an empirical question.
 
  
 
==See also==
 
==See also==

Revision as of 16:10, 9 September 2009

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Aumann's agreement theorem, roughly speaking, says that two agents acting rationally (in a certain precise sense) and with common knowledge of each other's beliefs cannot agree to disagree. More specifically, if two people are genuine Bayesians, share common priors, and have common knowledge of each other's current probability assignments, then they must have equal probability assignments.

See also

Blog posts

References

  • Robert J. Aumann (1976). "Agreeing to Disagree". The Annals of Statistics 4 (6): 1236-1239. ISSN 00905364.  (PDF)
  • Tyler Cowen and Robin Hanson (2004). Are Disagreements Honest?.  (PDF, Talk video)