It of course depends upon how you define the measurements. If you mean does the US GDP go up because of Wal-Mart this is a different question than is it good for jobs, or helping efficiency and logistics, or just-in-time delivery.Wal-Mart has a huge ability to set the low price because it is the big boy on the block. If Wal-Mart orders from a vendor it is in most cases the largest customer. This can be good for small vendors who then need to scramble to be able to keep up with demand, but challenging for those whose margins are cut because they finally have a partner large enough to go head to head with them.There are jobs that are displaced, but the consumer is saving money (and we are all consumers.) My guess is that is about a wash, but the big guys always get the bad press.Business has an interesting story about this here:
http://www.businessweek.com/magazine...9049_mz011.htm