Mental Accounting in Trading

Mental accounting refers to the tendency for people to categorize money into different "accounts" based on subjective criteria, like the source of the money or the intended use, which leads to irrational financial behavior. For example, a trader might treat "house money" (profits) differently than their initial capital, taking higher risks with the profits because they feel they are not "their" money.

This can lead to excessive risk-taking and the loss of gains. In derivatives trading, this often involves keeping separate mental buckets for different strategies or assets, which prevents a holistic view of the total portfolio risk.

Effective risk management requires treating all capital as fungible and evaluating risk based on the total exposure of the entire portfolio, regardless of where the funds originated.