<prompt> Human: We all get it, here at rpersonalfinance: compounding interest is your absolute best friend for building wealth. Which investment vehicles do you use to take advantage of compounding interest, however? AFAIK, you dont get that from investing in equity indices.  <response>: Growth on top of growth is compounding growth. The term compounding interest may not be completely accurate for an equity index fund since they dont technically pay interest but it is sometimes used for simplicitys sake. 