Checkpoint 3: As mentioned earlier, there are countless other sources of job- related frustration. Pay systems have always been central issues which generates high levels of friction between co- workers, employers, family, and friends. There will always be those who suffer for not earning enough and those who will also meet with misfortune and persecution because they earn too much. As stated in the August 1999 issue of Human Relations, "Pay systems have long been known to influence employees' level of job performance and withdrawal behavior."And in regards to paying people for their labor, blue collar workers have it especially tough as they must endure grueling labor, while often being spoken down to as though they were fools. As two mothers working in a television factory remarked, "They treat us like children the way they talk to us. They should try doing these jobs. They just stand there over you, telling you what to do"(The Economist [US], June 20, 1998 v347 n8073 pS12[1]). Bus drivers experience a similar situation. Approximately every six months, "rebids" come up, which gives the bus drivers a chance to select a route, time of day, number of hours and number of days to work. As expected, this too is determined by seniority. "Veteran" drivers choose first while "rookies" simply take whatever is left over. It is for this reason that one rookie bus driver works from 1 - 7:00pm, Monday through Saturday and has not had a free weekend in approximately two months.