Shorthand for "the investing public"--in the same way that "Wall Street" is used to refer to investment professionals and brokers.
Investopedia Says:
If you are investing in the market, you are considered a part of the "Main Street" fraternity.
Related Links:
If you're new to the stock market and want the basics, this is the tutorial for you! Stock Basics Tutorial
Do want to invest, but don't know how to begin? We'll show you the building blocks you need to get started. Investing 101: A Tutorial For Beginner Investors
There are many ways to make money, knowing how to choose the best stocks is one of them. Guide to Stock-Picking Strategies


