Former City trader Tom Hayes has been found guilty at a London court of rigging global Libor interest rates. He was sentenced to 14 years in prison for conspiracy to defraud. The 35-year old is the first individual to face a jury trial for manipulating the rate, which is used as a benchmark for trillions of pounds of global borrowing and lending. Many of the world's leading banks have paid heavy financial penalties for tampering with the key benchmark. The case was brought by the Serious Fraud Office, which said Hayes set up a network of brokers and traders spanning 10 financial institutions and cajoled or bribed them to help rig Libor rates for profit. During the trial, jurors were told that Hayes promised to pay a broker up to $100,000 to keep the Libor rate "as low as possible". Defence barrister Neil Hawes asked the judge to take into account the prevalence of Libor manipulation at the time, and also that ... managers and senior managers at Hayes' bank knew of, and in some cases condoned, Libor manipulation. Hayes ... rigged the Libor rates daily for nearly four years while working in Tokyo for UBS, then Citigroup, from 2006 until 2010. Rigging even minor movements in the rate can result in bumper profits for a trader manipulating the rates, or the rate can be moved simply to make a bank look more creditworthy.