This applies not only to product prices, but also to discounts. Therefore, the discount for products that will cost between US$ 0.99 and US$ 1.98 cannot exceed 50%. Products priced between $1.99 and $4.98 will receive a maximum discount of 75%. For items starting at $4.98 – up to 90%.
As reported on the Steam website, if an item’s base price is below the minimum transaction amount in a particular currency, it cannot be purchased in countries where that currency is used. The same applies to discounts: If the final price in some currencies is below the minimum transaction amount on Steam, the product will not be available to users in these countries either.
Source: Ferra

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