# Price lists and currencies

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Price lists are collections of SKU prices defined by currency and market. Only SKUs with a price in the active price list and stock in a market location are sellable. Schedulers, price tiers, and external pricing add further flexibility.
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## Price lists

[Price lists](/core-api-reference/price_lists.md) are collections of SKU prices, defined by currency and market. When fetching SKUs, only those with a price in the market's active price list and at least one stock item in one of the market's stock locations are returned. You can create price lists to manage international business or B2B/B2C pricing models.

### Price list schedulers

A [price list scheduler](https://docs.commercelayer.io/core-api-reference/) associates an alternative price list with a market, overriding the market's default price list for a defined time frame. The scheduler and the market must share the same currency and tax policy. If multiple schedulers are active at the same time, the one that started first takes priority. If multiple schedulers start at the same time, the one that ends first applies.

## Prices and currencies

A [price](/core-api-reference/prices.md) is the cost of an SKU associated with a currency and a price list. When a customer purchases an SKU, the price is taken from the order's active price list for that market. The same SKU can have a different price in each market — for example, $50 in *List A* for the US market and €45 in *List B* for the EUR market.&#x20;

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SKUs without a price in the active price list are not *sellable* in that market.
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### Price tiers

Commerce Layer supports up to **10 price tiers** per price. Two types of [tiers](/core-api-reference/price_tiers.md) are available:

* **Volume-based tiers** — the price of an SKU is determined by the tier the total quantity purchased falls within.
* **Frequency-based tiers** — the price of an SKU is determined by the tier the purchase frequency falls within. Typically used to apply discounts for recurring purchases.

### External prices

For more dynamic pricing or custom calculation logic, you can manage SKU prices [using an external service](/core/external-resources/external-prices.md). Set the external API endpoint at the market level and it will calculate the unit price of each SKU upon request.


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