Stock trader to comply with in their respective jurisdictions; or that tax free stock market operations are useful to boost economic growth. Beyond these costs are the opportunity costs of money and time, currency risk, financial risk, and Internet, data and news agency services and electricity consumption expenses—all of which must be accounted for. Jerome Kerviel (Société Générale) and Kweku Adoboli (UBS), two rogue traders, worked in the same type of position, the Delta One desk - a table where derivatives are traded, and not single stocks or bonds. These types of operations are relatively simple and often reserved for novice traders
Jérôme Kerviel over three days of trading beginning 2008, a period after which the market experienced a large drop in equity indices, and losses attributed are estimated at (). The bank claimed Kerviel "had taken massive fraudulent directional positions in 2007 and 2008 far beyond his limited authority" and that the trades involved European stock index futures. Though bank officials say Kerviel apparently worked alone, skeptics question how unauthorized trading of this magnitude could go unnoticed. Kerviel's unassuming background and position have heightened the skepticism that he worked alone. Some analysts suggest that unauthorised trading of this scale may have gone unnoticed