Potter warns that China, though a bright spot for GM and others, likely would not be able to carry the load if matters worsened in the United States and Europe.

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Loheide marked a spot for the helicopter to land with a smoke grenade while still under fire and then helped to load up the casualties.

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Load shifting is a type of arbitrage based on the fact that it takes about 24 hours for changes on spot prices at the NYMEX to feed into gasoline prices at the wholesale level, according to Mossman.

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