The money in the indexed accounts earns credit based in part on the movement of certain stock market indexes. (termlife2go.com)
What really appeals about the platform is that you can invest in certain stocks for FREE. (thecollegeinvestor.com)
So, if the prices rise for certain stocks in an index today, then their weights will rise, causing more buying of those same stocks tomorrow by passive managers. (amarginofsafety.com)