162 Capital and liquidity standards
BCBS (2019) also stresses that the denition of the regulatory boundary be-
tween the banking book and the trading book
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relied solely on the bank’s intent
to trade an instrument, and proved to be a key design weakness. It left open the
possibility for a bank to move instruments between its trading book and its bank-
ing book in pursuit of lower capital requirements, in particular during crisis times.
With Basel III, regulators committed to better cover market and counter-
party risks. This took place in several steps: Basel 2.5, the introduction of Credit
Valuation Adjustment (CVA) credit provisions in Basel III, and the fundamental
review of the trading book.
First, with Basel 2.5, the capital requirement ...