September 24, 2012
In the spirit of better investing, and in celebration of the first annual Worldwide Invest Better Day (WWIBD) coming up on September 25, Motley Fool analysts will be answering user- and reader-submitted questions leading up to the big event. "Ask a Fool" anything, and we'll do our best to help you invest better.
The S&P 500 (INDEX: ^GSPC ) is a capitalization-weighted index whose components are weighted by the total market value of outstanding shares. Because it's weighted this way, companies that are disproportionately larger -- like Apple (Nasdaq: AAPL ) and Exxon (NYSE: XOM ) -- have the most influence over the index, while those on the smaller end, like MAKO Surgical (Nasdaq: MAKO ) and First Solar (Nasdaq: FSLR ) , have a much lower weighting. In the following video, Fool.com analyst Austin Smith goes over everything that investors need to know about the S&P 500.
Click the green button below to join the thousands of people celebrating Worldwide Invest Better Day on September 25!