Rosternomics
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August 31, 2018

CLETOR

TOR won this trade +$18.4M surplus CLE won this trade +0.2 WAR
CLECLE Chris Antonetti net −$18.4M net +0.2
received +$35.2M+$35.2M ± $17M expected surplus · −$17.6M realized received 4.6 ± 2 expected · 0.5 realized WAR
Playoff odds: this deal moved CLE's 2018 odds 80% → 81% (+1.9 pts) — how trade timing is graded ↗
receives — most valuable first
Josh Donaldson3B·32y·R/R
+$35.0M+$35.0M± $17M exp surplusrealized −$17.6M 4.6± 2 exp WARrealized 0.5
Prior
league baseline (track record outweighs draft pedigree) → 0.21/yr
Evidence
recent form 6.8/yr over 2.3 seasons
Talent
4.58/yr blended
Horizon
1.0 control yr
TORTOR Mark Shapiro net +$18.4M net -0.2
received +$1.6M+$1.6M ± $19M expected surplus · +$0.8M realized received 1.1 ± 2 expected · 0.3 realized WAR
Playoff odds: this deal moved TOR's 2018 odds 2% → 2% (-0.2 pts) — how trade timing is graded ↗
receives — most valuable first
Julian MerryweatherP·26y·R/R
+$1.3M+$1.3M± $19M exp surplusrealized +$0.8M 1.1± 2 exp WARrealized 0.3
Prior
#158 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 × 0.94 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.