Book Two: Nominate Contracts · Section One: Contracts of Transfer of Ownership · Chapter One: Contract of Sale · Part One: Definition and Elements of the Contract of Sale
If the contracting parties do not specify a price for the subject matter of the sale, this shall not result in the nullity of the sale if it is apparent from the circumstances that the contracting parties intended to adopt the price prevailing in trade or the price previously applied in their dealings.
Interpretation and application must be checked against the official text and current version.