```xml <result> <column_name>total_cost_usd</column_name> <family>additive</family> <subtype>real_additive</subtype> <confidence>0.95</confidence> <requires_user_confirmation>false</requires_user_confirmation> <sum_meaningful>true</sum_meaningful> <signed>false</signed> <reducers> <primary_reducer>sum</primary_reducer> <valid_reducers>sum, min, max, mean, median, count, distribution</valid_reducers> <excluded_reducers>product (not a ratio), geomean (not a ratio)</excluded_reducers> <average_semantics>arithmetic_mean</average_semantics> </reducers> <inner_outer_measure> <inner_measure_reducer>sum</inner_measure_reducer> <outer_measure_reducer>sum</outer_measure_reducer> </inner_outer_measure> <multiplicative_partner_derivable>false</multiplicative_partner_derivable> <reasoning> Table-type gate: DIMENSION with no sequence axis makes multiplicative highly implausible. Column name "total_cost_usd" strongly signals real_additive (contains "total" and "cost", currency unit USD). Numeric evidence confirms: strictly non-negative with 35% zeros, mean 0.06 and max 1.23 (absolute magnitude, not centered near 1.0), unbounded upper range typical of accumulated costs. All signals align for real_additive extensive quantity where sum is the natural rollup operation. </reasoning> <table_type_conflict>false</table_type_conflict> </result> ```