Growth Engineering Playbook · Wave 2
Where should free shipping kick in — without losing money?
A margin-aware free-shipping threshold calculator, built on the fictional Northstar Outfitters order history. It models the three groups a threshold actually moves — orders you now subsidise, orders that nudge their basket up, and the conversion lift free shipping buys — then finds the threshold that maximises contribution, shows the conversion lift you'd need to break even, and contrasts the flattering "revenue uplift" story with the real number. The threshold is a margin decision, not a round number, and the answer is only as good as the two behaviour assumptions — so they're controls, shown with their sensitivity. Deterministic, client-side, order data only.
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Basket Distribution
Where orders sit vs the threshold — subsidised, within reach, or too far below.
Threshold Sweep
Net contribution vs baseline at each threshold. Click a bar to select it.
Scenario Economics
The margin math at the selected threshold — every effect, netted out.
The Number Most Teams Calculate Wrong
Revenue "uplift" vs real contribution — same policy, two very different stories.
Warnings
Where this threshold quietly costs money — the checks a round number skips.