Configuration/Core/client/html/catalog/stock/level/low

Summary
The number of products in stock below it's considered a low stock level

client/html/catalog/stock/level/low = 5


 * Default: 5
 * Type: integer - Number of products in stock
 * Since: 2014.03

Description
There are four stock levels available:
 * unlimited
 * high
 * low
 * out

If no stock information is available, the number of products is considered unlimited, which is useful for digital products. Zero or less products in stock means out of stock while a quantity of products above the option value represents a high stock value.

There can be the case that a stock level is sometimes negative even if only products that are in stock can be bought. This is due to the time difference the product is actually ordered and the stock level is decreased. If you've configured the stock level update every minute, within this minute another customer can buy the same product that is considered to be still in stock at this time.