Hello Tanja
Thank you for your comment.
I am of course aware that eating out/take-away is more expensive than buying the ingredients in a store and cooking them yourself (ingredients, staff, effort, rent, etc.).
My train of thought is that the price structure in the same category (e.g. take-away) must be fair and comprehensible. In other words, if ingredients for a menu should be cheaper (i.e. for "vegetables only") than for more expensive purchase costs (i.e. for "vegetable casserole").