Article 40 of Civil Code

1 - An offer may validly be addressed to unspecified persons, so long as the identity of the intended contracting party is not an essential consideration in contracting, subject to what the circumstances of the case require. 2 - In particular, the display of goods with their prices indicated constitutes an offer, without prejudice to the practices required by trade. 3 - Publication, advertising, the sending or distribution of price lists currently in use, and any other statement concerning offers or requests addressed to the public or to specified individuals shall not, however, be considered to contain an offer, unless the contrary appears from the circumstances of the case.