Through Open Culture I've learned about another free course from Yale. Financial Markets is a twenty-six part course that anyone can access. Videos, slides, and links to reading materials are available for each segment. The final exam complete with solutions also published as a PDF. You can find the entire collection of video lectures here. Embedded below you will find lecture #11 which is about stock markets.
Applications for Education
Most of the content in this course is probably too advanced for the average high school student to comprehend on his or her own. That doesn't mean it couldn't be used in a high school setting. The course materials could be part of an independent study in which you work on an individual, tutoring basis with students who have an interest in economics.
Here are some related items that may be of interest to you:
Yale Open Course - Introduction to Psychology
100 Awesome Open Courses
Justice, What's the Right Thing to Do?
COOL - Free Open Course Materials from McGill