Chang tried his hand at investing, purchasing large quantities of derivatives under Deutsche Bank's advice. Unfortunately, his scientific expertise did not translate into financial acumen, and as a result he lost $50 million in total. Chang initiated a counter-claim for the amount lost in response to the bank's claim for a sum of $1.7 million. While successful in his claim at the High Court, the decision was reversed on appeal, where the Singapore Court of Appeal stated that he had the requisite knowledge of shares to not rely on the advice of the bank. He also had to repay a $1.7 million debt incurred from investment losses. This case has since become a point of authority in contract law.
