The correct answer is B
Using the Sumitomo case as an example, Yasuo Hamanaka, a trader, attempted to corner the copper market. His fraudulent activities were possible because of weak operational controls. He was given broad powers, including granting power of attorney to brokerage houses, to create a financing scheme to fund his copper purchases in the spot market. Because of weak management oversight, he was able to keep two sets of books and execute large transactions without approval from senior management that would have been aware of and understood the trading strategies.
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