# Discounts

Thor supports product discounts and cart discounts for different stages of a purchase.
Choose the stage where the information your rule needs is available.

| Goal | Use |
| --- | --- |
| Show a reduced catalog price for selected variant prices | [Product discounts](/concepts/discounts/product-discounts) |
| Reduce an eligible cart total, selected lines, or shipping | [Cart discounts](/concepts/discounts/cart-discounts) |
| Require a buyer-entered code or control campaign combination | [Codes and combination](/concepts/discounts/codes-and-combination) |

## Match the rule to the problem

A sale on a named collection can be a product discount when it should affect the catalog price.
A promotion requiring a minimum basket amount needs cart context.
A customer-specific base price can instead be a [contextual price record](/concepts/pricing/prices); not every pricing difference needs a promotion.

## Conditions do not guarantee a saving

Validity, predicate matching, target selection, priority, and combination rules determine what applies.
Render the effective prices and discount applications returned by Thor.
Do not show a predicted saving merely because a code was entered or a rule exists.

Follow [Create a discount campaign](/guides/operations/discount-campaign) for one complete code-backed cart promotion, including eligible and ineligible test cases.
Use [Predicate language](/concepts/predicate-language) when writing conditions.