Definition

Model Decay

Meaning ⎊ The loss of predictive power or profitability in a model over time due to market evolution or alpha dissipation.
Greeks.liveMay 22, 2026

Model Decay

Model decay is the gradual decline in a trading strategy's performance over time as market conditions evolve and the alpha source loses its effectiveness. Financial markets are adversarial; as profitable patterns are discovered and exploited by many participants, the edge often dissipates.

Additionally, structural changes in market microstructure, regulation, or technology can render previously successful models obsolete. Monitoring for model decay is essential, as it allows traders to identify when a strategy needs to be retrained, adjusted, or retired.

This process requires ongoing performance tracking and a clear understanding of the strategy's underlying logic. A model that is not actively managed and adapted will eventually succumb to decay, leading to underperformance and potential losses in a changing market landscape.

Economic Model Stress Testing
Scoring Model Calibration
Market Impact Function
Latent Dirichlet Allocation
Delegate Proxy Voting
Transaction Price Slippage Limits
Parameter Constraints
Range-Bound Strategies

Glossary

Price Decay Model

Model ⎊ A price decay model is a quantitative framework used to predict the gradual reduction in an asset's value over time, often applied to options premiums, tokenized assets with vesting schedules, or assets with inherent deflationary mechanisms.