More on Halliburton (HAL -0.3%): Lowers its forecast for North America margins in its operational update, citing higher costs for guar gum as a result of its expansion of oil and liquids-related activity in North America. Guar gum is an agricultural commodity used as a blending additive to its fluids utilized in hydraulic fracturing. Margins are expected to be impacted by an additional 300 basis points more than previous guidance of 200-250 basis points.
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