CALL it an aberration, a slump, or a correction, the near-25% plunge in oil prices in the past three months comes with consequences. Some of the carnage is visible. As a group, the 199 biggest energy firms listed in the US have seen about 17% wiped off their stock. The RTS, Russia's stock exchange, has fallen by about the same, while the rouble is now a quarter cheaper than it was in July. Against the US dollar, Canada's loonie has shed 6% of its value.
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