[tomp]

> Wal-Mart delivers value for shareholders because they attract customers because they're cheaper and more efficient.

That doesn't really follow; it could also be, for example, that Wal-Mart delivers value for shareholders because they drove out all the competition and attract customers because they are the only place to shop at.

I'm not saying that's necessarily true for Walmart, but it's obviously true for US internet providers, to give just one example.