Many states and localities have adopted salary history bans in recent years. The goal of these bans is to stop the use of a worker's past salary to help formulate a starting salary for that worker at a new workplace. Advocates of the bans strive to diminish gender discrimination in the workplace and in particular to reduce the gender pay gap. The theory behind the ban is that on average women have a weaker salary history than men in part because of discrimination, and the use of salary histor...