Trading books are an integral tool used by financial institutions to document their trading activities. Primarily, trading books provide banks with a detailed, accurate record of all investments and activities related to the trading of financial assets.

The trading book is designed to reflect the net current value of a financial institution's holdings. It also allows for quick decision making and the appropriate management of strategic exposures and unsystematic risk. In other words, a trading book acts as a shadow portfolio, allowing banks to actively manage and adjust their assets while minimizing risk.

The evolution of computer technology and the increasing sophistication of trading strategies has led to the refinement of trading books. Banks now rely heavily on proprietary software and quantitative modeling to keep track of their trading positions. Whilst this technology is beneficial to the accuracy and accuracy of the trading book, it is still only as good as the data itself.

When trading books are managed correctly, they can be an effective tool in mitigating risk. Since trading books contain detailed records of a bank’s financial assets, they can accurately reflect the potential losses in case of specific events or market environments. This allows for better planning and decision making on the part of management.

In times of economic turbulence, the losses in a bank's trading book can have a drastic effect on the global economy as a whole. For example, when the global financial crisis occurred in 2008, banks had to close down their trading books in order to reduce losses and limit the damage. However, the same risk mitigation strategies used by banks can become a powerful tool when employed by regulators. By understanding the potential losses in trading books, regulators are better equipped to manage systemic risk in the financial system.

Thus, trading books remain an indispensable tool in the management of financial institutions. They provide an accurate documentation of all the trades of a bank and act as a risk-management tool. In addition, trading books can provide valuable information to regulators that are looking to mitigate systemic risk in the financial system.