ChatterBank6 mins ago
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Of course, while McVities invented Jaffa Cakes, they didn't register the name as a trade mark, so there are plenty of other brands available (especially supermarket own-label ones), which are often just as good (and almost invariably cheaper)
For example, the reason that Toblerone bars kept getting smaller and smaller was because the main sales outlet for them in the UK was (and possibly still is) Poundland. The retailer demanded a product which could always be sold for a quid, forcing the manufacturer to reduce the size of their bars.
Similarly people often complain about the ever-reducing weight in the tubs of Roses which are widely sold at Christmas. The reason it happens is because all of the big supermarkets demand a product which can still be sold for the same £5 price that they were charging over a decade ago.