That's a strange move. Right now the last thing oil producers need is even lower prices.
Consider that Saudi Arabia and Iran are on the opposing side of Islam sects, so the reason was to stump the sudden economic growth of their enemy.
Yes, it's centuries that people kill each over who was the correct successor of Muhammad, his cousin or his friend. Welcome to planet Earth...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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