Profit per sq foot is really the golden metric here. The problem is that profits, generally, are a lot harder to data collect into a metric like that, and a lot

Profit per sq foot is really the golden metric here. The problem is that profits, generally, are a lot harder to data collect into a metric like that, and a lot of the private equity activity that doomed many retail chains in the US were designed to artificially inflate profits. The three are all more or less related though.