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I bet most people think the war was supposed to make oil cheaper. Well, apparently not. I am convinced by these two guys, Jonathan Nitzan and Shimshon Bichler, who have been arguing for a decade or two that the aim of the war party is actually to make the stuff more expensive:
http://bnarchives.yorku.ca/
A cynic might wonder whether their own secret intention might be to get Israel off the hook, since, after "war for oil", the next most popular theory is "war for Israel", and in fact somewhere in there also is a free full-length downloadable book about the Israeli economy, which discusses the baleful economic and social effects of militarisation there, which are similar to those in the USA, or, if possible, even worse. They are friends with Doug Henwood, who edits the 'Left Business Observer' and who also has a handy, non-technical, free downloadable book, about Wall Street and its infamous investment bankers, on his site:
http://www.leftbusinessobserver.com/
I mention all this, which is, in social science terms, based on Thorstein Veblen style institutional analysis, to offer a more detailed alternative to the Misesians on the one hand and the Marxians on the other. I hope it helps - as I said, it's all free.