"Over decades, the (maybe at most semi-true) idea that products bought at Aldi or Lidl will provide high value despite their low price"
I hate to be defending Aldi's rep (or the allegedly faux idea), but as a regular shopper in Germany'S four major chains (Edeka, Rewe,Lidl, Aldi), I must insist: Aldi/Lidl ARE providing a good price-to-value ratio for customers :-)
Of course, with the organic & premium chains popping up the last decade(s) you can get better quality. But those high-quality shops are making up just a small share of the market [1].
Their competitors (REWE/EDEKA) will offer you a wide range of [lets say Beans], ALDI/LIDL will offer you just one. But while that one usually has the quality of the competitor's most expensive version it comes with the price-tag of the competitor's cheapest.
[1] http://de.statista.com/statistik/daten/studie/4916/umfrage/m...