What to do on a Friday afternoon when you have twenty minutes to spare but not inclined to start off a new topic? Break out the playdoh of course! I decided that Externalities would make a good revision topic.

The students could choose either negative or positive externalities, production or consumption. Most went for negative externalities of production (not surprisingly) but a couple went for a positive externality of consumption. They needed to explain to me what the externality was and what the options were for the government to intervene.

Some examples are shown below. They tended to go for the dramatic - waves of pollution destroying everything in its path. All good stuff!

My previous posts on using Playdoh can be found here - Playdoh Economics and Playdoh Economics (2)