I still don't know how this tokens are issued. I thought the chain issued them at the spot price known inside the chain thanks to the miners, but you say their price doesn't depend on the spot price.
If they are issued by finding a counter-party, what gets the counter-party exactly? How can you make money with antiOil-tokens?
See this post in the sister thread for an example of how coins/anticoins would be issued:
http://forum.bitcoin.org/index.php?topic=31645.msg400477#msg400477antioilcoins would go up when oilcoins go down, so buying them is like shorting oil. I expect some rules would have to be in place to keep them balanced, which I'll admit I haven't given enough thought to yet (see below).
Unless you can provide some value in exchange, you cannot assume to be able to create value out of thin air. Therefore, when you create an oilcoin (which is supposed to be equivalent to some amount of oil), the corresponding anti-oilcoin will be negative in value. It is basically a debt in oil. So, the value of your oilcoins will depend on other people's willingness to believe that you can balance that debt at any time. Moreover, if you allow anti-oilcoins to be traded freely (as your proposal reads), these people will want to see guarantees that everyone who receives the anti-oilcoins will be equally trustworthy with respect to repaying their debt. You can find excellent real-life example data on the dangers stemming from freely trading debts when you analyze the recent banking crisis.