Consumer surplus and producer surplus - http://www.youtube.com/user/BrynJonesOnline#p/u/18/WforwhGw5dI
Economics tutorial:
- Demand and Supply - http://www.youtube.com/watch?v=OYaoc2N2lhI
- Changes in demand - http://www.youtube.com/watch?v=4SpJgAHAIHU&feature=relmfu
- Changes in supply - http://www.youtube.com/watch?v=K_G-_izbPl8&feature=relmfu
