A daypart premium is a multiplier a creator attaches to specific windows, so a Saturday-night slot can price above a weekday afternoon; it is one of the rate-card modifiers applied on top of the base rate.
A multiplier a creator can attach to specific windows, so a Saturday-night slot can price above a weekday afternoon. It is one of the rate-card modifiers, alongside event and exclusivity premiums, applied on top of the base rate.