With block pricing, the user pays a preset price per block, even if they don't reach the maximum quantity in that block. With quantity discounts, the price per item decreases incrementally as the overall quantity increases. If a company using block pricing offers 1 unit for $5 but a pack of 10 for $40, it's equivalent to a 10% discount on a per-unit basis. The difference is in the presentation: with block pricing, you must buy in quantities of 10 to get the discount. With quantity discounts, you enjoy the benefits of the discount simply by ordering an amount within the discount threshold.