In my Principles of Economics class, we were recently comparing types of economic systems, particular Command Economies versus Free Market. We used the example of natural resource allocation. I mentioned the trade dispute between Japan and China regarding exports of Rare Earth Elements. See below story and impact on U.S.:
http://247wallst.com/2010/10/19/china-plans-to-withhold-more-of-rare-earth-elements-us-in-deep-trouble/
