Not timely, but I loved this
Bill O'Reilly explains to John Stossel how higher margin requirements make speculation riskier.
Also, prices aren't fixed; they're rigged. Which, I guess, is worse? I don't know.
Finally, Leah Goodman wonders how, if the current method and form of speculation are not evil, oil prices can go up while oil supplies go up. Ever heard of inflation? The overissue of currency, anyone?