If you think through your past investment activities, you may notice that some of your more significant mistakes have been related to emotions. For example, the market took a downturn, and you sold stocks when it was better to ride through the storm. This type of loss can be considered to be an emotional cost of investing. It may be one of the more significant investing costs that you could face, and these tips can help you to reduce the impact of emotions on your decision-making processes.