The annual budget passed for 2083/84 adjusted excise across the dutiable lines, moving the levies on tobacco, alcohol and selected petroleum products to keep the collection ahead of price levels and to steer consumption. Pack sizes and strengths carried the changes within a structure that adjusts rates rather than adding new products. The consumer effect reached the shelf in stages. Where the duty moved, manufacturers absorbed some of the increase and prices followed for the rest, so the full burden asymmetry, invisible at the counter, played out as the familiar jump in the packet, the bottle and the litre. Imported equivalents moved in step through the customs charge. For businesses the change was a costing exercise performed once a year. Stocks on hand before the new rates held the old duty, production after the date carried the new, and the boundary must be provable in the stock records when the returns for each period are filed. The operators who mark the budget date in their systems and split the stock ledger cleanly at it pass the period without disagreement, while the blurred boundary invites the arithmetic that reopen the file.