Fri. when I went to our little local market, their Best Choice (store brand) cake mixes were on sale for 69 cents. I knew the size was changing from 18.25 oz to 15.25oz. and the price was going up. They carry most all of the popular brands. Sure enough, the smaller sizes are, in some flavors, already decreased in size. It looks like all of the brand mixes are going to go to smaller size. I bought several mixes, but since I'm not going to replace my sheet cake pans, I'll just bake from scratch. It amazed me that 2 of the women buying mixes at the time, did not notice the decreased size until I showed them. The store still had some BC 18.25 oz on the shelf in chocolate and white mix, but yellow was already in the smaller box. I could feel the difference immediate, but I'm a person that is very detail oriented. Some people are not and don't notice it.
I'm afraid BC has made a mistake on this one by just not raising the price and leaving the size alone. On most commodities, where other things are not critical, such as pan size for the product, reducing the size can be much less of a problem, but with baking, other costly equipment elements are involved. There are too many scratch recipes out there geared to exisiting equipment. Personally, I won't buy 2 mixes and mess up another pan for the overage, for a cake. I'll just go from scratch to begin with.