Rosternomics
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July 16, 2021

ARIATL

ARI won this trade +$3.2M surplus ARI won this trade +0.4 WAR
ARIARI Mike Hazen net +$3.2M net +0.4
received +$2.4M+$2.4M ± $22M expected surplus · +$0.0M realized received 1.3 ± 3 expected · 0.0 realized WAR
Playoff odds: this deal moved ARI's 2021 odds 0% → 0% (+0 pts) — how trade timing is graded ↗
receives — most valuable first
Mason Berne1B·25y·R/R
+$2.3M+$2.3M± $22M exp surplusrealized +$0.0M 1.3± 3 exp WARrealized 0.0
Prior
#982 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
ATLATL Alex Anthopoulos net −$3.2M net -0.4
received +$0.8M+$0.8M ± $8M expected surplus · −$3.2M realized received 0.5 ± 1 expected · -0.4 realized WAR
Playoff odds: this deal moved ATL's 2021 odds 40% → 38% (-2.1 pts) — how trade timing is graded ↗
receives — most valuable first
Stephen VogtC·36y·L/R
+$0.9M+$0.9M± $8M exp surplusrealized −$3.2M 0.5± 1 exp WARrealized -0.4
Prior
league baseline (track record outweighs draft pedigree) → 0.21/yr
Evidence
recent form 0.8/yr over 1.2 season
Talent
0.51/yr blended
Horizon
1.0 control yr

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.