Behavioral Finance Applications

Overview

Translate behavioral-finance theory into quantifiable trading signals and risk-control rules. Core assumption: market participants systematically deviate from rational decision-making, and these biases can be predicted and exploited.

Applicable scenarios:

• Behavioral interpretation and parameter optimization for momentum / reversal strategies
• Contrarian signals when market sentiment becomes extreme
• Debiasing mechanisms in portfolio construction
• Capturing behavior patterns specific to retail-driven China A-share markets

Core Concepts

Overreaction and Underreaction

Underreaction → momentum effect:

Mechanism: anchoring bias + conservatism
  Investors anchor on old information and update insufficiently to new information
  After an earnings beat, the stock price digests it gradually rather than all at once
China A-share evidence:
  - Earnings-guidance beats still produce 3-5% excess return over the following 20 days
  - After analyst rating upgrades, momentum often persists for 1-3 months
Quant signal:
  SUE (standardized unexpected earnings) > 2σ -> buy and hold for 60 days
  Top 10% 20-day return -> continue ho…