Articles

A budget is a number. The year is a range.

Short reads on commodity prices, tariffs and cash. We take a budget, a business case or a guidance statement, rebuild it as a few drivers, and stress test it with 10,000 scenarios. Then we show what the one number leaves out: the odds, the downside, and the two or three drivers that decide it. Each piece says what the markets set, what management sets, and what a hedge is worth. Every number from a run is a real run.

// public-company figures from annual reports and guidance, rounded · the private manufacturer is an anonymised composite · hedges are in the models where the company has them · the models and ranges are our illustrative assumptions · not investment advice

How we did it

Each piece rebuilds a company as a simple driver model, the kind an FP&A team sketches on one whiteboard. Plan values are tuned to the public accounts, or for the private cases to a typical cost structure. Every driver gets a range, a shape and, where it matters, a correlation. Commodity and tariff ranges come from public forward curves and bank forecasts. Then 10,000 Monte Carlo scenarios per run through our engine. Sensitivities move one driver at a time between its P10 and P90. What-ifs re-run on the same seed, so the change in the answer comes from the assumption, not from sampling noise.

Hedging is taken into account. Where a company discloses a hedge, the range is the exposure after it: Airbus's currency book, ArcelorMittal's own mines. Where it does not, the base case is unhedged and a what-if shows the hedged book, so the hedge has a price instead of a footnote. Each article also splits the swing into what the markets set, what suppliers or the cycle set, and what management sets. The models and ranges are ours. None of it is investment advice.