Very glad that Dunnes Stores do NOT round up.
In order to break even with rounding one has to avoid buying one or two items - ie always buy MORE than two items - if they are priced at €X.99.
I find that I quite frequently want just one - or maybe two items - thereby potentially loosing 1.0 or 2.0 cents per transaction.
(I don't think I have ever seen anything priced at €X.01 ?)
So - in a country with a population of roughly 4 million, say a quarter of them buy a single item for €X.99 per week. That's one million cents, or ten thousand euro which has been 'rounded up'.
I would imagine that that's not unrealistic.
So €10,000 per week ends up in the accounts of Tesco, Aldi or what ever - just because we don't ask for the cent in change and put it in the nearest Charity box.
If we did - I'm sure Vincent de Paul or RSPCA or whatever your favourite charity is - wouldn't say no to ten grand per week.
I would personally prefer to avoid 'rounding' and get retail to introduce honest pricing - for example €5.00 and NOT a 'pretend' €4.99 - to make things sound cheaper.