Thanks to tutor2u for this update summary
http://www.tutor2u.net/blog/index.php/economics/comments/unit-1-micro-externalities-air-pollution-and-life-expectancy-in-china?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+economics_news+%28tutor2u+Economics+Blog%29#When:06:12:59Z
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