Leaving my local Tesco the other day I was accosted by a lady who wanted to interrogate me about my shopping experience. One of my friends tells me that he makes it a point of honour to lie wildly to market researchers and focus groupers whenever he gets the chance but I didn't have the brass neck for that.

However I seized upon the opportunity to complain about the lack of unsalted butter. Perhaps head office will pay attention since the local management didn't.

Or more probably they won't.

I noticed another weird pricing move in Tesco recently. They increased the price of a particular brand of muesli by 30 or 40 pence and a couple of days later brought it back to the previous level.

Presumably customers shunned it. I certainly did, but I bought it when the price fell back. Was that me falling prey to a cunning bit of shopping psychology?