Any person who edits, re-edits, reprints, imports or re-imports books destined for the market must fix a sale price for the public. The retail price for the book to the public must be between 90% and 100% of the price set by the publisher or importer. Retailers may establish sale prices lower than the fixed prices after 24 months that the books have been published for the first time or imported. The retailer may add to the effective price of the book the costs or fees that correspond to additional services provided and that have been agreed with the consumer, namely the cost of delivery at an agreed location.