Hi,

The psychological aspect of trading is extremely important, and the reason for that is fairly simple: A trader is often darting in and out of stocks on short notice, and is forced to make quick decisions. To accomplish this, they need a certain presence of mind. They also, by extension, need discipline, so that they stick with previously established trading plans and know when to book profits and losses. Emotions simply can't get in the way.
When a trader's screen is pulsating red (a sign that stocks are down) and bad news comes about a certain stock or the general market, it's not uncommon for the trader to get scared. When this happens, they may overreact and feel compelled to liquidate their holdings and go to cash or to refrain from taking any risks. Now, if they do that they may avoid certain losses - but they also will miss out on the gains.
Traders need to understand what fear is - simply a natural reaction to what they perceive as a threat (in this case perhaps to their profit or money-making potential). Quantifying the fear might help. Or that they may be able to better deal with fear by pondering what they are afraid of, and why they are afraid of it.

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