General Motors announced Tuesday that its long-awaited Chevrolet Volt hybrid, a battery- and gas-powered electric vehicle, can get 230 miles per gallon in city driving, dwarfing every other car on the market in fuel efficiency.

Editor’s Note: Robert Frank, author of The Economic Naturalist’s Field Guide: Common Sense Principles for Troubled Times, recently guest-blogged for several weeks here at the Business Desk with answers to some of life’s economic ironies: why brides…

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