In 1989 Anthony Daniels, aka Theodore Dalrymple, went to one of these department stores and describes how even the
shoppers in the store were fake -- here's an excerpt (more at the link [1]):
It didn’t take long to discover that this was no ordinary department store. It was filled with thousands of people, going up and down the escalators, standing at the corners, going in and out of the front entrance in a constant stream both ways – yet nothing was being bought or sold. I checked this by standing at the entrance for half an hour. The people coming out were carrying no more than the people entering. Their shopping bags contained as much, or as little, when they left as when they entered. In some cases, I recognised people coming out as those who had gone in a few minutes before, only to see them re-entering the store almost immediately. And I watched a hardware counter for fifteen minutes. There were perhaps twenty people standing at it; there were two assistants behind the counter, but they paid no attention to the ‘customers’. The latter and the assistants stared past each other in a straight line, neither moving nor speaking.
...snip...
I also followed a few people around at random, as discreetly as I could. Some were occupied in ceaselessly going up and down the escalators; others wandered from counter to counter, spending a few minutes at each before moving on. They did not inspect the merchandise; they moved as listlessly as illiterates might, condemned to spend the day among the shelves of a library. I did not know whether to laugh or explode with anger or weep. But I knew I was seeing one of the most extraordinary sights of the twentieth century.
[1] http://www.skepticaldoctor.com/2010/01/15/classic-dalrymple-...