You are right for the standard eg. Ja! Product line, where prices are the same in all discounters. But Rewe and Edeka put many products that are available as housebrands with Lidl / Aldi out of their cheap product lines into their named brands for much higher prices. Examples are certain cuts of meat, cheese, etc. Look for example at chicken breast, which comes from the housebrand for a cheap price at Aldi and Lidl, is sold for much higher prices (Wilhelm Brandenburg at Rewe) for much higher kg prices. Same meat same package plant imaginary markup for walking to Rewe.

If you have to closely watch your finances and need to feed several people, you should never go to Rewe or Edeka, ever, period.

Everyone saying that cannabis induced psychosis is fearmongering or does not exist is unfortunately wrong. Especially for a vulnerable subgroup the risk is definitely there. There are a multitude of studies on the subject, eg this (nature) one. Also check out the cited papers or look for cannabis psychosis in any medical database yourself. Alot of good info out there. The chance it will happen to the average consumer is quite low, after all it is one of the safest drugs out there, if consumed the right way. Thou saying cannabis induced psychosis does not exist is just plain misinformation.