Kweku Adoboli was arrested last year and is charged with fraud and false accounting, for allegedly losing his bank, UBS, a cool $2.3 billion in so-called unauthorised trades.<br /><br />The 32-year-old Ghanaian has pleaded not guilty to the charge.<br /><br />On Friday the prosecution accused him of acting like a naked gambler.<br /><br />GFX It said “The motive was to increase his bonus, his status in the bank, his job prospects and his ego.”<br /><br />“Like most gamblers he believed he had the magic touch.”<br /><br />At one level this is a trial about the misdeeds of a single rogue trader and how he was able to make such a mess of things for so long.<br /><br />In the public’s perception at least, the behaviour of banks like UBS is at the heart of the ongoing economic crisis.<br /><br />Al Jazeera's Sylvia Lennan reports.