"The character of the articles on sale could also be a reason for eviction, as Mrs. Kettlewell of shop 88, found out"

Though she never realised it. It was always a happy shop, after all.
That was how she viewed stock. Why waste time storing grim and unkind merchandise? Some people would buy that sort of thing, she supposed, but critical acuity had some points of reference she guessed, like a cornflakes advert, and from a strictly mercantile point of view, smiles tended to sell better than misery. So it was good business sense too.
Only cheerful products were therefore admitted to her shelves. Herbal remedies, books with lots of pictures, or comics, records of the sort that made you bounce, and snacks that did not empty your pocket. Nor did she begrudge parting with them, to pitman, bairn or chance caller.
Sometimes a flash of nostalgia came as she encountered a slight stain or shadow of some former commodity on a shelf, or - worse - the plain accusation of an empty drawer. But it wasn't as if she went short herself; she regarded selling more as a kind of sharing. And ultimately, she could always go out and get some more.
Of whatever it was. If you knew where to look. She had long ago abandoned the idea that there must be a mix of bad and good in everything. Shoddy production (or otherwise) was not her affair. The poorly made was cheaper, that was all. It lasted not quite so long, and that was expected. Sometimes she thought you got more variety that way (than if you bought one lasting thing, one joy for ever).
Of course, she knew that one day she would have to pack up. The store would be emptied and taken over by some other concern. Perhaps there would be no takers. That shook her a bit - the thought that no one might want to carry on trading here. It would be boarded up, she supposed, in that case. And left until someone rebuilt it, or found another use...
It hardly mattered, after all. 'My heart,' she reassured herself, 'is guaranteed to last my lifetime.' It never occurred to her that anyone would want to evict her.