GSM Your lawyer's mind must make you a far more analytical shopper than most.
We all know the minds capacity to fail to notice some events from the invisible gorilla experiment www.theinvisiblegorilla.com/gorilla_experiment.html
While making a normal shop, looking and choosins sfuff off the shelf, it is very easy to miss changes.
Recently my eye was drawn by a promotion on butter, it was a big reduction and, I admit, I was a bit puzzled by it, but I bought some amd it was only when I put it intot he fridge at home alongside some butter I had bought earlier that I realised that the pack wa smaller, weighing in at 200 grammes instead of 250. Gramme for gramme it was still cheaper than the bigger pack, so I still had a bargain, but in all the offer signs, I had failed to notice the decreased size.