tier minimum quantity
The quantity floor (inclusive) from which a tier price holds — 'buy N or more', as a count of the selling unit (a numeral on the QuantityUnits dimension — each, pair, set, case, dozen). 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.