Fable
The accountant finally knew how much oil each letter burned
The post station kept many fast horses, and the manager only looked at the total feed bill at month-end. The accountant initially handled things based on the cost of each trip, familiar with the routes and people, and rarely made mistakes when the operation was small. The accountant realized that the month-end total only showed how much was spent, not which types of requests, customers, models, or failed retries consumed the budget.
Later, as new business grew, feed costs soared, but no one knew which route burned the most money. After business expansion, cost growth decoupled from value; without request-level records, the team could only rate-limit by feel, which could both waste money and harm quality.
The first fix was rushed: the shopkeeper first blamed the groom for waste and had everyone feed one handful less hay. Ordering all horses to eat one handful less temporarily lowered the books, but did not identify the truly expensive routes, retries, and urgent shipments. Yet new problems followed, and everyone only stared at the most visible places, while small deviations in the distance accumulated ever deeper.
The accounting office records tokens, models, tools, cache, retries, users and workflows for each call, and links cost with quality outcomes, so it can calculate the true unit economics of a single service.
The bookkeeper hung a small tag on every letter, recording which route it took, how many horses were changed, whether it was urgent, and who placed the order. This step was troublesome and initially slowed the schedule; but after a few rounds, rework decreased, and the craftsmen no longer changed the rules on a whim. The bookkeeper could finally attribute costs back to specific calls and business outcomes, and cost-reduction decisions no longer relied on across-the-board cuts.
From then on, cost reduction no longer relied on across-the-board cuts, but on finding anomalies, optimizing routing, setting budgets, and allocating by actual consumption; every dollar could be traced back to a specific business result.
Half a month later, they discovered that the most expensive thing was not the long route, but urgent deliveries that repeatedly changed addresses. From then on, money had to follow specific jobs, so they could know where to save and whom to charge.