FIN 260 Lecture Notes - Lecture 63: Amos Tversky, Daniel Kahneman, John Von Neumann

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Behavioral Finance:
Overconfidence:
o People think they know more than they actually do.
o Past success in the stock market makes them think they have more ability
in the stock market.
That causes bubbles.
o Research from Shiller shows survey data up around 2000 bubble.
Feedback Loop:
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Document Summary

Feedback loop: higher prices higher confidence higher prices higher confidence, etc. Nuemann-morgenstern math, but rather fall back on rule of thumb & biases. Very strong challenge to orthodox economics & finances: kahneman & tversky"s first major paper came out in (cid:883)974, found that people have a tendency to generalize on basis of insufficient evidence. Ex: if i toss a coin 5 times & it comes up heads each time, i may conclude that the coin is unfair. But it"s more likely that the coin is fair & the string of heads is merely product of random chance. If you repeat this a thousand times, in game of tossing a coin 5 times, you get 5 heads every 1 in 32 trials. We take a few observations and conclude that is the way it is: ex: israeli training of pilots & mean reversion, pilots are learning to fly. Their skill is slowly improving through flight training, but very slowly.

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