It costs about $0.30 per packet.There are about 1bln children in the world under the age of 15. It would cost 300mln/day to give every child this little life saver. It would cost 109bln to feed all kids in the world. Because of the volume I think it is safe to assume that we could lower the price to half of that. Since not every kid needs it,the real cost would probably be closer to 25bln$/year..