The almost 10 percent nosedive in headline oil prices this week has many hallmarks of a shocking but short-lived slump, triggered by a confluence of external events and exacerbated by safety-seeking investors and momentum-chasing traders. By Tuesday afternoon, the crowded race to the exit was winding down, with prices recovering from three-month lows as traders reassessed the factors they blamed for the worst slide in four months: Greece’s debt woes; China’s stock market meltdown; talks with Iran over its nuclear program; a stronger dollar; a rise in the number of U.S. oil rigs; a breach of key technical triggers. Yet a deeper look at the market suggests an important and more lasting rethink may now be afoot: longer-term oil prices, normally less volatile and reactive than immediate delivery, have suffered an almost equally violent […]