Most cashiers work indoors, usually standing in booths or behind counters. In addition, they often are unable to leave their workstations without supervisory approval because they are responsible for large sums of money. The work of cashiers can be very repetitious, but improvements in workstation design are being made to combat problems caused by repetitive motion. In addition, the work can sometimes be dangerous; cashiers' risk from workplace homicides is much higher than that of the total workforce.