This is because other components of the portfolio have not always moved in the same direction as equities over long periods of time. (wellsfargoadvisors.com)
In order to diversify your portfolio, you want to try and find investments that don't always move in the same direction at the same time. (freemoneyfinance.com)
No matter how well our system was performing, we were never going to see all of our indicators move in the same direction at the same time. (kappanonline.org)