Whilst I have sympathy with your individual position, Tesco (and the other big boys) weren't all that bothered about the jobs lost by others when they marched into town - the corner shops, the high street shops - no direct link but certainly a casual link. You only need so much bread and milk, when you buy from Tesco you don't buy from the mom and pop shop. Every planning application for a store comes with a retail assessment showing how little damage it will do. Fantasy economics. Now, the jobs are simply moving on another step to resurgent discounter chains - Heron Foods, Farmfoods, B & M, Home Bargains and the rest. Better still, they are in town and I can get there on the bus rather than walking down a dual carriageway.
Yep, our family had a small corner newsagents - our turnover halved overnight when as Asda opening half a mile away. Absolutely no way we could compete. Some top guy from Asda was on TV once defending the closures of other shops around their new stores citing it was just "healthy competition"! Trouble was that people believed him.
It's not just prices either, as Asda didn't discount newspapers, magazines, greetings cards etc which was our staple product offering. People went there instead of us for convenience as they bought their news and mags alongside their other shopping or the morning walk there was easier than to us, or they could park easier there on their way to work, etc.
The good thing is that today, smaller independent stores are opening up again and are viable by offering cash machines, long hours, Paypoint, collectplus, lottery, etc., and opening in more convenient locations such as where there is easy parking rather than traffic-calmed or pedestrian areas, so the tide is turning against the huge stores again as people start to value local convenience again.
Ironically, our family shop survived because we turned it into more of a convenience store, selling groceries, fruit & veg, etc., where we captured people living closer to us than the Asda who needed something when they ran out. Even more ironically, we bought the groceries to sell from Asda and Kwik-Save which was cheaper than the wholesalers!
But, back to the OP, I think the main reason for Tesco's demise is their over-complicated selling strategy devised to con and confuse the shoppers, such as constant BOGOF, or 2 or a fiver, cheap multipacks, etc., all encouraging shoppers to buy (and waste) more than they need, and with yo-yo pricing making pretend special offers look good. Not to mention the ever-smaller pack weights/sizes to give the illusion of bargains that aren't. Shoppers aren't stupid and have got well and truly fed up with the constant dishonesty.
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In my view there are to many Supermarkets, twenty years ago we seemed to manage fine with probably a third of the number that now exist.
No, there've always been loads of chains. Not 100% sure on dates, but roughly around 20 years ago we also had Kwik-save, Fine-Fare, Safeway, Netto, VG and Co-Op in addition to Tesco, Asda, Morrisons, Booths, Spar who've so far survived.
Going right back to the 60s/70s we had Redmans, David Greig, Lipmans, who were chains on many town centre High Streets, which were effectively closed down by the likes of Tesco and FineFare moving into the town centres.