Rosternomics
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June 23, 1998

OAKDET

DET won this trade +$0.8M surplus OAK won this trade +1.2 WAR
OAKOAK Billy Beane net −$0.8M net +1.2
received +$0.8M+$0.0M ± $12M expected surplus · −$4.0M realized received 1.5 ± 2 expected · 0.8 realized WAR
Playoff odds: this deal moved OAK's 1998 odds 1% → 1% (+0.1 pts) — how trade timing is graded ↗
receives — most valuable first
Bip Roberts2B/OF·34y·B/R
+$1.0M+$0.2M± $12M exp surplusrealized −$4.0M 1.5± 2 exp WARrealized 0.8
Prior
no pedigree — league baseline → 0.21/yr
Evidence
recent form 1.6/yr over 1.9 season
Talent
1.06/yr blended
Horizon
1.5 control yr × 0.92 age decline
DETDET Randy Smith net +$0.8M net -1.2
received −$0.8M−$0.8M ± $17M expected surplus · −$3.2M realized received 0.7 ± 2 expected · -0.4 realized WAR
Playoff odds: this deal moved DET's 1998 odds 7% → 6% (-1 pts) — how trade timing is graded ↗
receives — most valuable first
Jason Wood1B·28y·R/R
−$0.8M−$0.8M± $17M exp surplusrealized −$3.2M 0.7± 2 exp WARrealized -0.4
Prior
#307 overall draft pick — at the league baseline → 0.21/yr
Evidence
no MLB track record — leans on pedigree
Talent
0.21/yr blended
Horizon
5.5 control yrs × 0.64 age decline

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.