What customers leave against what the building and the rota cost. The crossing is your number. The Corner Café, illustrative.
The costs that come anyway: £157,062 a year, whether anyone walks in or not.
Four ordinary disasters, run on the Chapter 6 cash valley, one at a time or all together.
Contribution and fixed costs from Chapter 5; cash model from Chapter 6 (`04-workbook/tests/ch07-stress-model.py`). Shock sizes are judgements. April 2027 wage rates were not announced at 13 October 2026; last April's rise was 4.1% (GOV.UK). Nothing here is advice about a particular business. Respects your reduced-motion setting.