tier minimum quantity
The quantity floor (inclusive) from which a tier price holds — 'buy N or more', as a count of the priced atom in a PURE COUNTING UNIT (a numeral on the QuantityUnits dimension — each/piece). An order floor counts the priced atom itself: 'buy 5 or more cartons' is 5 each of a carton-version, the pack word 'carton' deriving from that version's `contains` (b81), not from this unit — pack/sale units are not stored (D1-Delta2). A qualifier of the tier-price host, bound to one tier statement. A quantity-break table is contiguous and exhaustive-upward, so each tier's band is [this floor, the next tier's floor) and the open-ended top tier is [floor, infinity); the upper bound is therefore the next tier's floor (downstream ordering), and a single floor fully specifies the schedule for both graduated and volume modes. Its magnitude is realised; the unit is the governed token.
Tier minimum quantity is a measured figure, given as a whole count of selling units.
It is a qualifier of tier price — it has meaning only inside a tier price statement, one per statement, never on its own. It belongs with tier price to pricing — what it costs.
It is answered inside every tier price statement, not as a standalone question on a kind.
Answered inside every tier price statement — not a standalone slot on any kind.