Arbitrage Profitability Decay

Arbitrage profitability decay describes the phenomenon where the potential gains from a specific arbitrage strategy diminish over time as more participants enter the market or as the market becomes more efficient. As competition increases, the time window for capturing price discrepancies narrows, and the spreads between exchanges tighten.

Eventually, the costs of maintaining the necessary infrastructure and the risks involved may outweigh the expected returns, rendering the strategy obsolete. This cycle is common in the development of new financial markets, where early inefficiencies offer high returns before being competed away.

Understanding the rate of decay is essential for firms to determine when to pivot their strategies and allocate capital to new, less saturated opportunities.