Why fairness, not speed, is the ultimate validation of stock markets

The PayEng Playbook

Stock markets prioritize fairness over speed, ensuring all participants receive market data simultaneously rather than racing for the fastest execution. Modern electronic trading has shifted from horizontal scaling approaches to deterministic matching engines that use atomic clocks and event sourcing to maintain consistent ordering across distributed systems. These architectural patterns—emphasizing fairness, determinism, and auditability over raw speed—directly apply to building payment ledgers and financial systems that must maintain a single source of truth under heavy traffic while producing consistent, reproducible results.

From Stock Markets To Ledgers Series, Part I