compare-at price
The strike-through reference amount a conditional sale price is shown against ($40, struck through, beside the $30 sale). A qualifier of the sale-price host, bound to one sale-price statement, as a numeral on the same currency unit. Its magnitude is realised; the currency is the governed unit. The discount percentage a surface prints is presentation derived from (compare-at − sale), never stored.
Compare-at price is a price, given as an amount in a currency such as USD or EUR.
It is a qualifier of sale price — it has meaning only inside a sale price statement, one per statement, never on its own. It belongs with sale price to pricing — what it costs.
It is answered inside every sale price statement, not as a standalone question on a kind.
Answered inside every sale price statement — not a standalone slot on any kind.