 In turn product controllers are responsible for insuring traders mark their books to fair value prices.There have been high profile cases of where banks have been fined for this control but working effectively, examples including the USA's financial services regulator, the Securities and Exchange Commission, fining European investment bank Credit Suisse over mis-marking bonds during the height of the subprime credit crisis.Poor product control procedure were also noted in the collapse of US investment Bank Lehman Brothers.