Strange package sizes

There’s obviously some packaging scam going on here that I can’t quite sort out. Breakfast cereal seems to come in two sizes, say 16 oz and 21 oz. Visually, the two are almost equivalent, perhaps the larger size will be less than an inch taller and not visisbly wider when looking at the retail shelf. The price for the larger size can be very small; yesterday I saw a 20c increase for the larger size. Why would anyone, therefore, buy the smaller size?

If you ignore promotions (half price, 2 for 1) on either size, what is the purpose of the two sizes in the line? Is it a tactic to gain more shelf space by offering more product choices? That’s my best guess, but that just seems to ridiculous, I don’t want to believe it’s true. Any insights, please leave a comment!


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