GGB Through a short list of nameable lines: the landed cost of imported ingredients (freight plus insurance surcharges), booking confidence and tourist covers on the revenue side, the labour percentage as sales move, and cash. Each line moves at a different speed, and each has an operating control — re-quoting landed costs, dual sourcing, a pre-agreed short-menu mode, labour flexing and a weekly cash runway read.
From How Regional Turmoil Reaches a Restaurant P&L — the full reading, with the method behind this answer.