Money is how you get people to do things they wouldn't otherwise do. Farmers don't like farming they do it for the money, truck drivers do it for the money, factory workers do it for the money.
So if we get rid of economics then who's going to farm the food, who's going to pick the food, who's going to transport the food to the stores (although at that point I guess they are just public distribution centers), who's going to run the stores?
They only solution to all of these problems is automation but we're not there yet. So what is your solution for today?