Investors love bubbles, but they also need something to worry about. The latest is the oil price. Brent crude is nearly a fifth higher per barrel now than at the end of 2011 – at $123, not far off its 2011 peak of $127. Gasoline at the US pump is approaching $4 a gallon. Oil producers may be happy, but everyone from President Barack Obama’s re-election team to mom-and-dad stockpickers are watching nervously. They should worry less.
投资者喜欢泡沫，但他们也需要担心某些事情。最新的担忧是油价。目前布伦特(Brent)原油价格已较2011年年末上涨近20%，至每桶123美元，与去年每桶127美元的最高点已相距不远。美国汽油价格接近每加仑4美元。原油生产商或许感到开心，但从美国总统巴拉克•奥巴马(Barack Obama)的竞选连任团队到散户股民，所有人都在不安地关注着油价。他们不必如此担心。
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