Since the name of Walmart has come up a number of times in this thread, let me tell you about two experiences I had.
The first was to do merchandising every two weeks for a particular company's summer cosmetics and sun-screen products. I was to go to the back room, get the big boxes that had come from Company X and that contained what I was to put on the shelf, and put the contents on the shelf. About 2/3 of the visits I went to the back and found literally a mountain 12 feet high of cartons from various companies that blocked access to where my box or boxes were supposed to be, so I could not get them. On half of the few occasions when I could get to the rack or location where the boxes were supposed to be, they were not there. I was given so little time for this work, anyway, that I often spent my allotted hours simply straightening the merchandise on the shelves and making the department look presentable again.
The second Walmart experience I had involved a mystery shopping company with a name I have repressed, and happened several years ago. The assignment was to go to the CD Department of Walmart, find 50 different CDs, and put them in the order on the racks where they should have been. I am sure I was assigned this because Walmart already knew the place was a total mess. In other words, go through the CDs and when you saw one that was on their list, make certain it was where it was supposed to be -- in the correct subsection of the CD racks.
I was given 1 hour to do this for all 50 titles. After two hours, I had only been able to find about 18 of the CDs. The CD department was in such an unorganized mess, various genres of music were scattered all over the place in locations they were not supposed to be in.
At that point I decided that since they were only going to pay me below minimum wage for the work I was doing, I had had enough.
In my report I stated that I had spent twice the allotted time and had only been able to find 18 of the titles. I also stated that the CD department was in such a bad mess that once could not do the job in a number of hours, and certainly not in one.
Walmart rejected my report and would not pay me. At that point I had done several hundred mystery shops, and this was the only one a mystery shop company's clients refused to pay for. It has never happened again, either. After that, I have refused to do any work at any Walmart.