Does Trading in Derivatives Affect Bank Risk? The Canadian Evidence

We delineate the impact of derivatives trading on asset risk for Canadian banks over the period starting 1997 till the fallout of the bank crisis in 2007. In light of the remarkable resilience of Canadian banks in dodging the current financial turmoil, we investigate whether such bank stability is attributable to effective risk management through derivatives use. After imputing asset risk from bank stock prices based on the option-theoretic model of Merton (1974), we ascertain the links between the implied asset risk and derivatives use for trading and hedging purposes. Our findings reveal that not only bank risk increases with trading in derivatives, but increases also with derivatives reportedly used for hedging. This puzzling evidence is robust to different model specifications and alternative methods of estimations. Our new evidence is important in two ways. First, it casts doubt on the effectiveness of hedge accounting. Second, it shows that the use of derivatives by Canadian banks does not explain their envied soundness. We therefore conclude that prudent practices limiting original risk exposures remain fundamental for safeguarding a healthy financial system. This lesson from Canada is particularly relevant for China, given its developing financial infrastructure and extreme reliance on banks in providing financing to its economy.