I have noticed that Migros is reducing the discounts from time to time: first 50% then 40%, 30% then only 20%. Migros is optimizing/increasing its profit margin in this way. You used to be able to buy the products regularly at the same discount again and again. Also, when the 'for sale by' date was reached, a 25% discount was initially granted and even reduced to 50% towards closing time. Currently, you only get a fixed 33% discount - this is to save relabeling work and marginally increase profits.