News roundup: Middle- and low-income families benefit from declining supermarket prices … Better batteries, more electric cars spell bad news for oil industry … US malls set to lose billions as retail gloom deepens

    At the checkout: Average supermarket prices fell 2.2% in September from a year ago, the most since late 2009, USA Today reports. Supermarket prices been down on an annual basis for 10 straight months,…

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