MOD_01
Contribution margin
The unit is the smallest repeatable economic object in the business. It may be an order, account, project, location, or month of service. The definition must match the way costs scale. When service hours, support, onboarding, infrastructure, payment processing, refunds, or fulfillment rise with volume, the variable-cost ledger must show them.
CONTRIBUTION / UNITrealized revenue − variable costShow both dollars and percentage. Keep list price, collected price, and concessions separate.
Probe: did realized price fall, did variable work rise, or did the mix shift toward a unit that was never profitable?
MOD_02
CAC payback
Acquisition is an investment. Payback asks how long the new customer must generate contribution before the investment is recovered. Use a blended definition for the company view and a channel definition when the operator is deciding where the next dollar should go.
PAYBACK / MONTHSCAC ÷ monthly contributionUse contribution, not revenue. Separate contractual timing from collected-cash timing.
Probe: is the payback extending because CAC is higher, contribution is lower, sales cycles are slower, or first-90-day service cost is being deferred?
MOD_03
Cohort retention
Logo churn and revenue churn answer different questions. Gross retention shows what remains before expansion is counted. Net retention adds expansion and reactivation. Cohorts protect the analysis from the false comfort of a young customer base or a few large expansions.
GRR / PERIOD(beginning MRR − churn − contraction) ÷ beginning MRRPair with activation, usage, support intensity, and realized contribution.
Probe: is the newest cohort reaching first value, renewing, and expanding at the same rate as earlier cohorts?
MOD_04
Cash efficiency
Growth quality is ultimately tested by cash. Reconcile contracted revenue with invoices, collections, failed payments, refunds, and the variable costs paid before customer cash arrived. The rolling view is usually more useful than a noisy single week.
BURN MULTIPLEnet burn ÷ net new ARRState the burn definition and use the same window for numerator and denominator.
Probe: did the business buy growth by financing receivables, delivery, inventory, or acquisition before the unit paid back?