# What happens when a shopper changes the quantity in the cart?

> How quantity changes in the cart move the discount, by offer type, for gifts and add-ons.

The discount follows the cart, not the offer the shopper picked. Raising or lowering a quantity can move the cart to another tier, or drop the discount. It depends on the offer type.

## Volume discount

- The cart moves between tiers. A shopper who picks **Single** and raises it to 2 in the cart gets the 2-unit discount.
- Lowering the quantity below a tier drops to the next tier that fits.
- With **Percentage off** or **Amount off**, the biggest tier the cart reaches covers every unit.
- **Fixed price** works in packs, so it doesn't cover every unit. With 2 for $30 and 5 units, two packs cost $30 each. The fifth unit falls to the next lower tier that fits.

## Buy X get Y

- Every full set of Buy + Get units gets the free units.
- With Buy 2, get 1, going from 3 units to 2 loses the free unit. Going to 6 gives 2 free.

## Mix and match

- Removing an item, or changing one item's quantity, drops the discount for the whole set.
- Without a **Quantity selector**, a set with doubled quantities also loses its discount.
- With a **Quantity selector** on, the discount stays when every item's quantity is the same multiple of the set.

## Free gifts

- A gift from an offer stays free while the cart reaches that offer. Dropping below it charges the gift.
- Moving up to a bigger offer can charge it too. The bigger offer takes over, and only gifts added with that offer count.
- A shopper who raises the gift's own quantity pays for the extra units.
- A gift from **Gifts to unlock** stays free while any offer that unlocks it is reached.

## Checkbox upsells

The discount covers at most as many add-on units as bundle units. Extra units cost full price.

## Related

- [Why isn't my bundle discount applied at checkout?](https://section-store.orka.help/a/why-isnt-my-bundle-discount-applied-at-checkout)
- [Why is my free gift missing or charged at checkout?](https://section-store.orka.help/a/why-is-my-free-gift-not-showing-or-charged)

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