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Positive externalities - a follow up

Ben Cahill

21st February 2011

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As a follow up to my previous post on a great example of a product with positive externalities, a little more research has uncovered a short video clip and some nice graphics that can be used when showing the class.

The video clip is from the company website and can be found here.

You can take your pick from the graphics below. They are nice and colourful, and maybe the science students can help to explain them!

imageimage

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Ben Cahill

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