[sydd]

> This only makes sense if you think poor people are dumb or naive. They don't know how to compare prices?

Its pretty hard when each thing is served in a different size container and it can have different values from the most important ingredient. This is sometimes pretty easy to figure out (e.g. juices usually have the same 2-3 sizes where I live) but sometimes its practically impossible to know whats the best value for money, e.g. paper towels -- size, number of layers, number of sheets, total length etc are all the parameters that one should consider. Or bring a precision scale?