It offers nothing for the fundamental problem with capitalism (well, one of them) - it doesn't measure the demand from those with no purchasing power. 
People who have no money aren't anywhere in the ledger. No business incentive exists to provide their demands but they need them as much as everybody else. 
There hasn't been a famine caused by a shortage of food in over a hundred years. A few were caused by things like wars, but even those are the minority.

The vast majority of famines since the end of world war one was caused by just one thing: lack of money. Meantime the world is overproducing food to the extent that we burn enough food every year to feed all the hungry people in the world twice over. But it's better for farmers to burn that food than to sell it - because such an oversupply would drive the price down below the cost of production. Nobody wants to run at a loss because there's too much of what they are selling.