Firstly, thanks for the downvote, back at your simply because I disagree. Reddit is seemingly very anti independent shops, it must be a mindset. I said what I said from experience, not opinion. My opinion is that chain stores are cunts, my experience is they're bad at it.
Secondly, my point, and I am going to assume you're a townie. a bottle of Coke will be the same bottle of Coke where ever it is sold. The difference is logistics and supply chain. Tesco have their own network. Spar and the likes are franchises and use the brand's supply chain. Mr Smith's Newsagent may get his stock from a cash and carry and wotnot. Uncle Tesco chain of supply is massive and swallows so much money. Now, if I go to Uncle Tom's farm in Little-Bridge-Upon-River I will get the finest farm bred animals; Chicken that pray to the moon, Cows that have velour bedding etc. The chicken Uncle Tom's won't necessarily be sold much more than Uncle Sainsbury's, I can get a brace of wood pigeons for £2 for example, a poussin at Tesco was, last time I checked, around £4. Vegetables are the same, buying from the grower means there hardly is any transport overhead. I'm not one to live for the Goodlife (I don't knit or wear my own Hemp jumpers).
Basically, the more I check the unitary price and price-per-weight in supermarkets the more I am astonished by the difference in price with my neighbouring shops (I live on a high street). I know beans I buy from a shop who gets delivered by a farm 5 miles up the road sells it cheaper and in season that Dutch tomatoes that grow in sheds then transported to the UK to a wholesale market then redistributed to stores.
I'm not even angry, each to their own, you can get Prince Charles' bacon at Tesco and it is damn fine but it's expensive AF. I can get thick bacon from a farmer who was at school with my uncle for cheaper, and he breeds the pigs. It's a no brainer.
Now... I'm not ignorant to I am lucky to live God's Own Country and my city, the fourth in population in the UK, has countryside mere miles from the city centre with grown and bred food within reach. I know not everyone is as lucky as that.
PS: Morrison's pizzas are pretty nice, especially half-price from the nearly-out-of-date bin.