Knowledge (XXG)

Keynesian beauty contest

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differences between the groups. Fifty percent of the first group selected a video with a kitten, compared to seventy-six percent of the second selecting the same kitten video. Individuals in the second group were generally able to disregard their own preferences and accurately make a decision based on the expected preferences of others. The results were considered to be consistent with Keynes' theory.
73:"It is not a case of choosing those that, to the best of one's judgment, are really the prettiest, nor even those that average opinion genuinely thinks the prettiest. We have reached the third degree where we devote our intelligences to anticipating what average opinion expects the average opinion to be. And there are some, I believe, who practice the fourth, fifth and higher degrees." (Keynes, 65:
some inference from their knowledge of public perceptions. This can be carried one step further to take into account the fact that other entrants would each have their own opinion of what public perceptions are. Thus the strategy can be extended to the next order and the next and so on, at each level attempting to predict the eventual outcome of the process based on the reasoning of other
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faces among all judges, rather than those they may personally find the most attractive. This idea is often applied in financial markets, whereby investors could profit more by buying whichever stocks they think other investors will buy, rather than the stocks that have fundamentally the best value,
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A naive strategy would be to choose the face that, in the opinion of the entrant, is the most handsome. A more sophisticated contest entrant, wishing to maximize the chances of winning a prize, would think about what the majority perception of attractiveness is, and then make a selection based on
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tested the theory by having its listeners select the cutest of three animal videos. The listeners were broken into two groups. One selected the animal they thought was cutest, and the other selected the one they thought most participants would think was the cutest. The results showed significant
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Keynes described the action of rational agents in a market using an analogy based on a fictional newspaper contest, in which entrants are asked to choose the six most attractive faces from a hundred photographs. Those who picked the most popular faces are then eligible for a prize.
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is, or even on what investors think other investors believe about the asset's value, but on what they think other investors believe is the average opinion about the value of the asset, or even higher-order assessments.
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because when other people buy a stock, they bid up the price, allowing an earlier investor to cash out with a profit, regardless of whether the price increases are supported by its fundamentals.
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Nagel, Rosemarie (1995). "Unraveling in Guessing Games: An Experimental Study".
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describes a beauty contest where judges are rewarded for selecting the
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Keynes believed that similar behavior was at work within the
259:, Ch 12. General Theory of Employment Interest and Money 195:
The General Theory of Employment, Interest and Money
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The General Theory of Employment, Interest and Money
205: 192: 162:"Ranking Cute Animals: A Stock Market Experiment" 75:General Theory of Employment, Interest and Money 8: 35:and introduced in Chapter 12 of his work, 16:Economics concept regarding equity markets 152: 212:(2nd ed.). New York: NYU Press. 7: 208:Game Theory for the Social Sciences 257:The State of Long-Term Expectation 199:. New York: Harcourt Brace and Co. 14: 1: 191:Keynes, John Maynard (1936). 31:The concept was developed by 304: 288:Social science experiments 129:Focal point (game theory) 230:American Economic Review 134:Guess 2/3 of the average 21:Keynesian beauty contest 168:. National Public Radio 204:Moulin, Herve (1986). 79: 124:Comparative advantage 100:National Public Radio 71: 283:Keynesian economics 160:Kestenbaum, David. 41:(1936), to explain 33:John Maynard Keynes 273:Behavioral finance 43:price fluctuations 87:fundamental value 295: 246: 237:(5): 1313–1326. 223: 211: 200: 198: 178: 177: 175: 173: 157: 94:Example contests 303: 302: 298: 297: 296: 294: 293: 292: 263: 262: 253: 226: 220: 203: 190: 187: 182: 181: 171: 169: 159: 158: 154: 149: 119:Tactical voting 115: 96: 67:rational agents 58: 17: 12: 11: 5: 301: 299: 291: 290: 285: 280: 275: 265: 264: 261: 260: 252: 251:External links 249: 248: 247: 224: 218: 201: 186: 183: 180: 179: 151: 150: 148: 145: 144: 143: 136: 131: 126: 121: 114: 111: 95: 92: 57: 54: 15: 13: 10: 9: 6: 4: 3: 2: 300: 289: 286: 284: 281: 279: 276: 274: 271: 270: 268: 258: 255: 254: 250: 244: 240: 236: 232: 231: 225: 221: 219:9780814754306 215: 210: 209: 202: 197: 196: 189: 188: 184: 167: 163: 156: 153: 146: 142: 141: 137: 135: 132: 130: 127: 125: 122: 120: 117: 116: 112: 110: 107: 106: 101: 93: 91: 88: 84: 78: 76: 70: 68: 62: 55: 53: 51: 48: 44: 40: 39: 34: 29: 26: 22: 234: 228: 207: 194: 170:. Retrieved 165: 155: 138: 105:Planet Money 103: 97: 83:stock market 80: 74: 72: 63: 59: 36: 30: 25:most popular 24: 20: 18: 278:Game theory 172:January 14, 140:Family Feud 267:Categories 185:References 98:In 2011, 77:, 1936). 113:See also 56:Overview 243:2950991 166:NPR.org 50:markets 241:  216:  47:equity 239:JSTOR 147:Notes 214:ISBN 174:2011 102:'s 45:in 269:: 235:85 233:. 164:. 69:. 52:. 19:A 245:. 222:. 176:.

Index

John Maynard Keynes
The General Theory of Employment, Interest and Money
price fluctuations
equity
markets
rational agents
stock market
fundamental value
National Public Radio
Planet Money
Tactical voting
Comparative advantage
Focal point (game theory)
Guess 2/3 of the average
Family Feud
"Ranking Cute Animals: A Stock Market Experiment"
The General Theory of Employment, Interest and Money
Game Theory for the Social Sciences
ISBN
9780814754306
American Economic Review
JSTOR
2950991
The State of Long-Term Expectation
Categories
Behavioral finance
Game theory
Keynesian economics
Social science experiments

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