Behavioral patterns persist in prices if __________.[Fill in the blank]

Question

BlackTom AI · Accepted Answer

Limits to arbitrage allow behavioral patterns to persist because rational traders cannot always fully or quickly eliminate mispricing caused by investor biases.

1. Relevant knowledge points and concepts
- Efficient Market Hypothesis (EMH): if markets fully reflect available information, predictable behavioral patterns in returns should not persist.
- Arbitrage: trading to exploit mispricing. When arbitrage is unconstrained and frictionless, it forces prices back to fundamentals.
- Limits to arbitrage: frictions such as short-sale constraints, transaction costs, funding/liquidity risk, and fundamental risk that can prevent or delay corrective trades.
- Behavioral finance: investor biases (overreaction, underreaction, herding) can create predictable patterns in prices.

2. Step-by-step reasoning
- Behavioral biases create systematic price deviations from fundamental value (step A).
- Arbitrageurs would normally trade against these deviations, profiting and pushing prices toward fundamentals (step B).
- If there are limits to arbitrage (e.g., short-sale bans, high trading costs, risk of losses before mispricing corrects, or funding constraints), arbitrageurs cannot or will not fully exploit the mispricing (step C).
- With limited corrective trading, the biased behavior’s impact on prices remains, so behavioral patterns persist (step D).

3. Intermediate steps / illustrative examples
- Example: Overpriced “glamour” stocks attract retail buyers. Shorting them is costly and risky (risk of further price increases and margin calls). Arbitrageurs may avoid or scale back short positions, so the overpricing persists.

4. Why the correct answer is correct
- Option b states there are limits to arbitrage activity. This directly explains why mispricings from behavioral biases are not fully corrected and therefore can persist in prices.

5. Why other options are incorrect
- a (markets are weak-form efficient): Weak-form efficiency implies past price patterns are already incorporated; it would argue against persistence, not for it.
- c (there are no significant trading costs): If trading costs are low, arbitrage is easier and mispricings would be removed, so patterns would not persist.
- d (market psychology is inconsistent over time): Inconsistency in psychology would reduce stable, repeatable patterns; persistence requires systematic, repeatable biases.

6. Conclusion
Therefore, behavioral patterns persist in prices if there are limits to arbitrage activity — confirming the correct answer is b.

Behavioral patterns persist in prices if __________.[Fill in the blank]单项选择题

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