michael adams wrote

I eat four large eggs per week. Always free range. Formerly from
Sainsbury until the yolks started breaking. Then from Lidl, around
the corner from Sainsbury around 50p less. Until those yolks started
breaking as well and there was a break in supply. None on the shelves.
Tried Aldi instead, definitely no broken yolks for the same price.

Continuity of supply. Don't the dopes at Lidl and elsewhere
realise that punters will carry on buying a slightly inferior
product week after week, maybe even at an uncompetitive price,
from the same shop simply out of habit and convenience ?
Run out of stock and they will be forced to go elsewhere
where they may find a slightly better product. Or the same
at a cheaper price. Which they'll now buy from there from now on.

Both Aldi and Lidl don’t even attempt to provide
everything the normal shopper wants to buy.

Yes, that is an unusual approach, but it clearly works for them profit wise.

Aldi doesn’t even routinely stock something as basic as chutney,
just has an occasional chutney offer and very little choice with
anything they offer, its what is on the shelf or go elsewhere.