Behavioral Finance - Limits to arbitrage; noise trader risk

6 important questions on Behavioral Finance - Limits to arbitrage; noise trader risk

What is the price pressure effect (1+r)^2(p*)^2?

If the price today is pushed up, it means that the return is pushed down

What is the Friedman effect (1+r)^2sigma_rho^2

Noise have a misperception in expectation, however they all have the same misperception; when the noise traders are positive, they are all positive and vice versa -> so they all want to buy/sell at the same time thus pushing the price up or down at the same time

What is the create space effect (2lambda)musigma_rho^2?

Noise traders increase the risk in the market. By doing so they push out the sophisticated traders. This is because the sophisticated traders are risk averse and thus with increased risk they will not very aggersively tradfe against the noise traders. So the noise traders therefore create their own space in the markets and will not b epushed out by sophoisticated traders
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How can noise traders have a higher return than sophisticated traders?

  • Utility of sophisticated traders by definition higher than utility of noise traders
    • Demand for unsafe asset derived from utility maximization, misperception creates bias
  • Extra return does not compensate for extra risk for noise traders -> lower utility

So the return of noise traders can be higher, but the risk that they are taking is proportionally even higher

What do noise trader create?

  • Excess volatility; market prices move too much relative to their fundamental prices
  • Mean reversion; they can push the price in the short term, but in the long-term the price will mean revert

Waht do noise trader NOT create?

  • Momentum; their misperception is completely random so they do not create momentum!

The question on the page originate from the summary of the following study material:

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