Actually it's costing jobs, so not good news.
Plus for Aldi is minus for Sainsburys, so some sort of balance there. But Aldi and Lidl work with less staff in many ways to do the job, so costing jobs overall.
For example, Lidl insisting drivers from other companies delivering to them must unload their own trucks and put the stock away correctly into their supermarket warehouse section. Either that or the company loses their business.
And checkout staff have to work at much higher speed using multiple barcode locations on their goods, meaning less checkout staff for a given throughput.
Not saying this is all bad, just sticking to the facts.
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Not always madness, it would be mad of me not to use the best. I really can't be bothered going though all that Aldi and Lidl sell to find out what's good and what's not, since price is irrelevant to me, and I don't want to do multiple part shops. I don't even know what I pay for most items since I never look at the prices, just buying what I want, which is the best of everything.
So I use a very large Sainsbury's over five miles away that has a vast range of everything in stock , rather than my local mid sized Sainsburys under two miles distant which often hasn't. This pattern of behaviour is surely the benefit of having more than enough money, there's no point in having money otherwise, if not to better life.
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If you are happier to pay more for the same then crack on.
That's what keeps them in business I guess.
I have seen the light though. When fresh fruit and veg costs 59% to 70% less and the same with bread, nappies and other essentials then I know where I would rather shop.
Brexit is going to bankrupt us all. So time to start saving those pennies