Whether the proportion among them is correct is a valid point, but since the extra cost of the different categories is cumulative to the household budget, there

Whether the proportion among them is correct is a valid point, but since the extra cost of the different categories is cumulative to the household budget, there is an argument for stacking them. It would make more sense if it were proportional to household spending between categories, but I suppose then some of the categories would be too thin to see the increase.