Are you a passive or an aggressive investor? A passive investor will buy long-term investments and wait for them to appreciate. These are usually low risk investments and will help build up retirement portfolios. It is important to develop a plan when you are retirement investing for the long-term. This will help you to stay focused and not pull your investments out due to fear. Whether you are a passive long- term investor or an active short-term trader, the importance of diversification cannot be overstated. Adding both long and short-term investments to your portfolio is the best way to minimize risks and add security to your retirement investments.