Rosternomics
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December 15, 1999

MIAKCR

MIA won this trade +$8.8M surplus MIA won this trade +1.6 WAR
MIAMIA Dave Dombrowski net +$8.8M net +1.6
received +$0.8M+$0.8M ± $18M expected surplus · +$0.0M realized received 1.0 ± 2 expected · 0.0 realized WAR
Playoff odds: this deal moved MIA's 2000 odds 3% → 4% (+1.2 pts) — how trade timing is graded ↗
receives — most valuable first
Sean McNally1B·27y·R/R
+$0.7M+$0.7M± $18M exp surplusrealized +$0.0M 1.0± 2 exp WARrealized 0.0
Prior
#443 overall draft pick — at the league baseline → 0.21/yr
Evidence
no MLB track record — leans on pedigree
Talent
0.21/yr blended
Horizon
6.0 control yrs × 0.76 age decline
KCRKCR Herk Robinson net −$8.8M net -1.6
received −$3.2M−$3.2M ± $27M expected surplus · −$8.8M realized received 0.0 ± 3 expected · -1.6 realized WAR
Playoff odds: this deal moved KCR's 2000 odds 2% → 2% (-0.7 pts) — how trade timing is graded ↗
receives — most valuable first
Todd DunwoodyOF·25y·L/L
−$3.0M−$3.0M± $27M exp surplusrealized −$8.8M 0.0± 3 exp WARrealized -1.6
Prior
league baseline (track record outweighs draft pedigree) → 0.21/yr
Evidence
recent form -0.4/yr over 1.0 season
Talent
-0.06/yr blended
Horizon
4.0 control yrs

Each player is valued on what he was expected to produce at the time of the trade, versus what he actually produced for his new team.

Expected WAR blends a player's pedigree (composite top-100 rank / draft slot, or a baseline) with his recent track record, projected over the years of team control acquired. The ± figure is a historically calibrated predictive standard deviation, measuring how widely comparable forecasts have missed around their expected value. Surplus values that production at the FA market price of a win (~$8M/WAR) minus salary — so cost-controlled players carry large surplus and expensive ones little, even at the same WAR. Who won is descriptive, not a skill claim: ~99% of a trade's outcome is unforeseeable at the time.