Teaching economics means teaching graphs. More accurately, teaching economics involves teaching spacial thinking. The trick os to get students to be able to visualized the graphic models, or at least be able to visualize how changes might affect the graph. There are many ways to do this through lecturing or having students run through problem sets. The ideal would be to have graphs that move and are interactive. There are many sites that have interactive graphs to use in economics. Here are a two of the better ones.
Wolfram demonstrations has interactive graphs for high school economics (and loads of other subjects) that are available for download. These graphs are nice because the illustrate some of the more subtle concepts that are crucial to fully understanding a concept, such as the relationship between revenue and elasticity.
Think Economics has a good set of interactive graphs with explanations, policy prescriptions and some questions (in which the inactive part involves demonstrating the solution on the graph).
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