anything on sale has to also show the lowest price it has been in the last 30 days
This is one of the more genius ideas I've come across in recent times. I have often noticed how products on "sale" are actually a few cents above the actual price it was a couple of weeks back. I can usually remember the prices of stuff once I see the price tag and so when I go back to the same supermarket and see a known item on sale, I compare to what it was the last time I saw the price and not surprisingly it isn't what they advertise.
If a 20% sale was supposed to reduce the price by $2 for example, the sale price is often reduced by $0.5 for example, or $0.5 above what it was last I checked. Hence some information on the price would over 30 days would definitely take a lot of the inside manipulation out. Even better would be to show the customers at least 2 of the lowest prices in the last month. Because the supermarkets could easily reduce the sale price by just a cent and make it look like it is the lowest in a month.
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It should work, since Finns tend to follow the law and I am sure it is going to come with fines for non-compliance. Also, Finns tend to watch each other closely! :D