As a very good Migros customer, the short redemption periods of 10 days force me into an almost grotesque shopping behavior, i.e. on many days I have to divide my purchases into less than CHF 20 (or shop at the competition) in order not to receive the 3, 6 or 9-fold for the larger purchase too early - I want to have the opportunity to extend the bulk purchases to the entire duration of the promotion, i.e. until 20 Feb.So instead of SelfScanning , I am forced to make 2 or 3 SelfCheckouts under CHF 20 (with corresponding comments!) or at the attended checkout according to the same pattern. Or even simpler: these purchases at Coop, Lidl, Aldi.... QUESTION: Why is the validity of the 3, 6 or 9-fold not GENERALLY given as a validity period until the end of the promotion ?