Decreto-Lei n. 138/90 de 26/04/1990. Obliga que os bens destinados à venda a retalho exibam o respectivo preço de venda ao consumidor. Diário da República I Série n. 96 de 26/04/1990 Pagina 2012

This decree-law mandates that goods intended for retail sale must clearly display their final selling price to consumers. This ensures transparency in pricing for shoppers. This affects all retailers and consumers in Portugal, requiring clear price labeling on products offered for sale.