That is false. I know, I dealt with it. Most of that problem had to do with shelf saying it on sale, and the employee that was suppose take the sign down didn't. At my store, if the sales ad was for the current week, the item showed up on computer every time. Most people either don't read the ad, or an employees made a mistake on putting the shelf tag on wrong item. It was either customer couldn't read, or employees made a mistake on what is on sale and what is not. Or the sale expired while the sign was still on the item. Heck, one guy actually gave me a news ad for half of crap he had, and was wondering why he didn't get the sales price for it, and the news ad was expired by two weeks. That wasn't a computer error.
There was a rare time where the sales ad was current week and an item was not ringing up on sale, however, I had that information on hand that it was suppose be on sale, there was a mistake in computer somewhere, and when I did the price change it worked without manager approval.
Number one reason why stores perform poorly is communication, the second reason is lack of work ethic. I was 17 and 18 years old dealing with customers over the price. Hell, one guy asked me if he could have TV 500.00 off since it was last one we had. I told him, "no, I'm trying make a profit here." He did reported me to manager for saying that to him, but come on, man, this is retail not a car dealership. I was reported to manager 4 times, only written up once and that had to do with me coming up short on cash register I signed off on. Whoops.
Oh well, life goes on.