That crossed-out price has had a rule since 2022

You are standing in front of a jacket with two prices: 89.90 crossed out and 44.95 in red. Since 2022, that 89.90 cannot be any number the shop likes. Royal Decree-Law 24/2021 brought the European directive known as Omnibus into Spanish law and amended the Retail Trade Act, the 1996 statute that governs sales: in any announcement of a price reduction, the previous amount displayed must be the lowest that shop has charged in the preceding thirty days.

That turns the classic trick —raising the price two weeks before the sales and then crossing it out— into a consumer offence rather than a seasonal bit of cheek. And it leaves you a ten-second check before you pay: ask the shop for the history of that previous price, or look it up yourself on their website or a price tracker. If the 89.90 only existed for five days in October, the real discount is under 45 euros.

The thirty days are calendar days counted backwards from the day you see the sign: they do not reset because the shop changes the poster or because a new campaign begins.