Cost Avoidance Quantification ties Catalyst's behavioral guidance to specific dollar amounts. When a traveler books a hotel at $189 after seeing a rate target nudge showing the city average is $220, the system captures that $31 differential as cost avoidance attributable to the intervention. This isn't theoretical savings — it's calculated from actual booking data compared against established benchmarks. Cost avoidance is tracked per tactic, per touchpoint, and per traveler segment, giving travel managers defensible numbers for leadership reporting. The methodology uses tolerance thresholds and outlier removal to ensure the numbers are conservative and credible.