This reading passage is an example of which element of the plot?

It has already been observed, that, in the basement story of the gable fronting on the street, an unworthy ancestor, nearly a century ago, had fitted up a shop. Ever since the old gentleman retired from trade, and fell asleep under his coffin-lid, not only the shop-door, but the inner arrangements, had been suffered to remain unchanged; while the dust of ages gathered inch-deep over the shelves and counter, and partly filled an old pair of scales, as if it were of value enough to be weighed. It treasured itself up, too, in the half-open till, where there still lingered a base sixpence, worth neither more nor less than the hereditary pride which had here been put to shame.