Software Application/Game Theory

[Game Theory] The Prisoner's Dilemma (μ£„μˆ˜μ˜ λ”œλ ˆλ§ˆ)

πŸ’‘ Game?

 The happiness of each participant with the outcome depends not just on his or her own decision but on the decisions made by everyone. 

κ²Œμž„ μ°Έκ°€μžλ“€μ˜ 결과에 λŒ€ν•œ λ§Œμ‘±μ€ 개개인의 결정에 μ˜ν•΄μ„œ κ²°μ •λ˜λŠ” 것이 μ•„λ‹Œ λͺ¨λ‘μ˜ μ˜ν•΄μ„œ κ²°μ •λ˜λŠ” 것.

 

πŸ” Game μ†Œκ°œ

  • 두λͺ…μ˜ μš©μ˜μžκ°€ .
  • μš©μ˜μžλŠ” 자백λ₯Ό ν•  수 있고(C), μžλ°±μ„ ν•˜μ§€ μ•Šμ„ μˆ˜λ„ μžˆλ‹€(NC).
  • μ•„λž˜ μš©μ˜μžλ“€μ˜ 선택에 λ”°λ₯Έ 감μ˜₯에 μ‚΄ κΈ°κ°„(Payoff)이 μžˆλ‹€.
  Suspect B's  NC Suspect B's  C
Suspect A's  NC A : -1 B: -1 A: -10 B: 0
Suspect A's  C A : 0 B: -10 A: -4 B: -4
  • Rational Playλ₯Ό ν•΄μ•Όν•œλ‹€.

πŸ” κ²°κ³Ό

두λͺ…μ˜ μš©μ˜μžλ“€μ€ μ–΄λ–€ 선택을 ν• κΉŒ?

 

이 κ²Œμž„ μ—­μ‹œ Strictly dominant strategyκ°€ μ‘΄μž¬ν•œλ‹€.

λ°”λ‘œ A, B 두 용의자 λͺ¨λ‘ Cλ₯Ό μ„ νƒν•˜λŠ” 것이닀.

 

Why?

λ§Œμ•½ 용의자 Bκ°€ NCλ₯Ό 선택할 λ•Œ 용의자 AλŠ” 0인 Cλ₯Ό μ„ νƒν•˜λŠ” 것이 더 λ‚«λ‹€.

그리고 용의자 Bκ°€ Cλ₯Ό 선택할 λ•Œλ„ λ§ˆμ°¬κ°€μ§€λ‘œ -4인 Cλ₯Ό μ„ νƒν•˜λŠ” 것이 λ‚«λ‹€.

 

κ²°κ΅­ Strictly dominant strategy에 μ˜ν•΄ 두 용의자 λͺ¨λ‘ Cλ₯Ό 선택해 4년을 감μ˜₯에 μ‚΄ 것이닀.

 

πŸ’‘ Striking Phenomenon ( μŠ€νŠΈλΌμ΄ν‚Ή ν˜„μƒ )

λ‘˜λ‹€ λ™μ˜ν•˜μ— μžλ°±μ„ μ•ˆν–ˆλ‹€λ©΄,,,, 4년이 μ•„λ‹Œ 1λ…„λ§Œ 감μ˜₯살이λ₯Ό ν–ˆμ„ν…λ°.......

Rational Play이기 λ•Œλ¬Έμ— λΆˆκ°€λŠ₯....

 

μ°Έκ³  : https://www.cs.cornell.edu/home/kleinber/networks-book/

λ°˜μ‘ν˜•