RRosternomics
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Liam O'Leary Trade Value & Calculator

What is Liam O'Leary (PIT, P) worth in a trade? The model projects $+2.3M of expected surplus over his remaining 6yr of team control. Below: he's pre-loaded on Side A of the simulator — add players, cash, or another team to build a complete trade. Toggle to raw WAR up top.

Surplus = expected WAR over remaining team control × the FA market price of a win, minus the contract cost over those years. The $/WAR is tier-adjusted — empirically, FA signings price elite-tier talent at ~$11-13M/WAR and replacement-level vets at ~$5M, not a flat $8M. So Skenes' WAR is worth more per unit than a 1-WAR utility guy's. How the tiered $/WAR works ↗

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Rosternomics — quantifying front-office skill, attribution-clean. Follow @rosternomics on X. Decision-makers on record back to 1933; resource-controlled metrics (WAR & payroll) cover 1985–2026.
Data: FanGraphs (WAR), Baseball-Reference & the Chadwick Bureau register (rosters, IDs), the Lahman Database, Baseball America prospect rankings (via The Baseball Cube), and public payroll records. Transaction and trade data was obtained free of charge from and is copyrighted by Retrosheet. Executive birth/death data via Wikidata (CC0); bios are original. Emoji graphics by OpenMoji (CC BY-SA 4.0).
All figures are franchise-level outcomes credited to the decision-maker in the acquisition year — not solely attributable to one executive.