This is to ensure that none of your inventory prices go below the amount you specify after an inventory aging rule has been set in place. 

Additionally, this prevents any item that you list from being priced at anything below the number you enter.  

For example, if you do not want anything in your inventory sold for anything under $10, enter “10” in the box.  If an item is currently priced at $11.00 and there is a 50% discount rule in place, it will only discount the item to $10.00 and will not be set at $5.50.