Spanish Constitution, 1978

Article 51.

The public authorities shall guarantee the protection of consumers and users and shall, by means of effective measures, safeguard their safety, health and legitimate economic interests. The public authorities shall promote the information and education of consumers and users, foster their organizations, and hear them on those matters affecting their members, under the terms established by law.Within the framework of the provisions of the foregoing paragraphs, the law shall regulate domestic trade and the system of licensing commercial products.

Article 53.3

Recognition, respect and protection of the principles recognized in Chapter 3 shall guide legislation, judicial practice and actions by the public authorities. They may only be invoked before the ordinary courts in accordance with the legal provisions implementing them.