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Unit economics and contribution margin

A correct per-transaction contribution-margin calculator, verified on held-out cases.

You receive: A reviewed unit-economics calculator + the passing test report, run on your numbers.

Part of Choose Business Model, Win Market, Pitch Investors

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Cost25 credits

ProtectionHeld until verified delivery

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Example

A sample of what this play produces. Your result is generated for your inputs.

positive

470Contribution margin cents

0.235Contribution margin pct

Breakdown

Revenue cents560

Rail cost cents88

Judge cost cents2

Trust safety cents0

Inputs

Gmv cents2000

Take pct0.28

Judge cost cents2

Rail pct0.029

Rail flat cents30

Arithmetic recomputed against the tasks.py compute_unit_economics oracle, 2026-08-08: take is 560 cents (28 percent of a 2000-cent GMV), rail is 88 cents (2.9 percent plus a 30-cent flat fee), judge_cost is 2 cents, and no ts_rate was supplied so trust_safety_cents is 0. 560 minus 88 minus 2 leaves a contribution of 470 cents, 23.5 percent of GMV.

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