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This article mainly talks about the positive externalities of being obese, but also mentions negative externalities: "If your friends and family get fat, chances are you will too, researchers report in a startling new study that suggests obesity is 'socially contagious' and can spread easily from person to person. If obesity is considered a traditional disease then the contagious effect represents a clear negative externality. Others can only be made worse off if your illness increases the chances of their getting sick."

I think this article is good, because it shows both negative and positive externalities. Negative because the outcome of eating a lot of junkfood is something no government likes, and it eventually has a backlash on them because people can't work as well and the general health in the country drops. Because of this they want to make people eat less, and they could to it with a tax to change the equilibrium. This would make the quantity demanded closer to that wanted from the government. (In the article they did it by banning 16-ounce softs drinks) Can you see the positive side?

The article I chose shows the difference in how the governmet treats businesses. They penalise businesses with negative externalities but don't reward businesses with positive externalities.