Price is right . . . or not

I never understand these labels scattered among the supermarket aisles like currants in a bun comparing the price in the supermarket you are in with Asda, Sainsbury, Tesco or whatever.

You must have seen them, the "Tesco's price 56p - our price 56p!!" ones or whatever. Now what I don't understand is if there are a couple of labels in an aisle saying they are the same price as the supermarket down the road, does that mean that everything else is more expensive? That seems to be the logic.

If they are so keen on telling us they are the same price then surely they would have brass bands and dancing girls out to tell us everything else was cheaper.They don't so presumably they aren't.