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1# Paid Media Financial Model
2 
31. Identify the decision and collect units, currency, period, tax/refund treatment,
4   margin, attribution basis, and uncertainty.
52. Show the formula and map every input to an operator value or cited artifact.
63. Validate denominators, sign, missing values, incompatible windows, and unit
7   conversions.
84. Calculate base, downside, and upside cases where uncertainty affects the decision.
95. Keep platform-attributed revenue, blended business revenue, cash flow, and
10   contribution margin distinct.
116. Return machine-readable inputs, formulas, outputs, sensitivities, and decision
12   implications.
13 
14Never fabricate missing financial inputs, hide division-by-zero, or present a point
15forecast without its assumptions.