Mint, the free money management service, regularly posts interesting infographics on its blog Mint Life. Last week they posted their 25 most popular infographics of the year. Included in that list was What Is a Stock? What Is a Stock? uses clear graphics and plain terms to explain what a stock is, offer a brief history of stock markets, and give a brief explanation of why people buy stocks.

Personal Finance Software – Mint.com
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Applications for Education
Paired with Common Craft’s video Stock Markets In Plain English, What Is a Stock? could make for a nice introduction to a lesson on stock markets and investments.