How Stocks Work Full Size Verison Share | Have A Question About This Topic? Address Thank you! Oops! Related Contents From Boats to Brokers From the Dutch East India Company to Wall Street, the stock market has a long and storied history. Four Really Good Reasons to Invest There are four very good reasons to start investing. Do you know what they are? What Is the Dividend Yield? This calculator helps determine your pre-tax and after-tax dividend yield on a particular stock.