06-reference

cfosecrets unit economics foundational anchor

2023-03-03·reference·source: CFO Secrets·by The Secret CFO
cfofinance-operating-layerunit-economicsfoundational-anchorcontribution-margin

Unit Economics (Foundational Anchor, March 2023)

Why this is in the vault

The original / foundational Unit Economics piece that anchors the later Costs Behaving Badly / 7 Levers P&L / Strategic Unit Economics arc. Pre-corpus-boundary (March 2023, before the Nov 2024 cutoff used elsewhere in this backfill) but processed because it is the load-bearing definitional reference the rest of the unit-economics corpus presupposes. Foundational definition: "unit economics = incremental marginal contribution generated for each individual unit sold; marginal contribution per unit = revenue per unit less variable costs per unit." Three operating principles: "the science of how your business makes money" (frame), "actionable greater than perfect" (model-complexity discipline), "every rockstar I've ever worked with can do this on a napkin" (the napkin-test for unit-economics literacy). Volume Step Cost Analysis is introduced here as the practical methodology that reveals inflection points where cost structure must shift. Breakeven Volume = Fixed Cost per Period / Contribution Per Unit is the load-bearing formula. No sponsor on the original piece - 2023 corpus predates the formalized sponsor-rotation model.

Mapping against Ray Data Co

The napkin-test principle is the right disciplinary frame for any RDCO bet's economic case. Current state: SC has explicit unit economics (subscriber acquisition cost vs lifetime value), MAC has scoped unit economics (per-engagement model), Squarely has unit economics in flight (per-puzzle download vs ad RPM). The napkin-test demands all three be expressible in one line each at any time - a discipline worth running monthly. The "actionable > perfect" principle also maps onto the harness-engineering thesis: building portable, accessible models beats building exhaustively-correct models that no one uses. Volume Step Cost Analysis is the right tool for understanding when the L5 agent build crosses the inflection point from "cost-per-task drops" to "cost-per-task levels off and then compounds" - the same step-cost framing applies to API-call economics as to manufacturing capex. This is the canonical reference whenever RDCO writing needs to ground a unit-economics argument; pair with [[06-reference/2024-07-06-cfosecrets-costs-behaving-badly-unit-economics-i]] for the next-layer arc.

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