>>A proven fact, huh?<<
Yes. a retail outlet that offers for sale a thing that nobody buys will either disconinue the item or go out of business. It is pretty much econ 101.
Of course, the more important point is that people will not simply stop buying the items so the point is really moot.
The issue is portion size. To prove the original point, proof would have to be provided that customers first stopped buying the items because the portion size was too large.
If you confuse the other factors, perceived value, taste, presentation, then you cannot prove the customers stopped buying simply because of portion size.
That is true, in general. In this case, there are multiple factors involved, and SJSAMPLE has asserted that when one of the factors, portion sizes, has been proven to be the deciding factor in customers rejecting food items, THEN the restaurants stop selling them.
If that factor could be isolated from all the others, then his point could be proven. So far, there has been no proof of that single factor being isolated as a singular cause of customer rejection of food items.
That’s the point.