It could be a great opportunity to add small-cap exposure to your portfolio.There are some good reasons all stock investors should have small-cap exposure in their portfolios. For example, small caps inherently have more growth potential than their large-cap counterparts -- after all, most of the stocks currently in the large cap S&P 500 index started out as small caps.In addition, small-cap stocks are likely to disproportionately benefit from falling interest rates, which is widely expected to happen over ...