California employers can no longer ask job applicants about their prior salary and - if applicants ask - must give them a pay range for the job they are seeking, under a new state law that takes effect Jan. 1. AB168, signed Thursday by Gov. Jerry Brown, applies to all public- and private-sector California employers of any size. The goal is to narrow the gender wage gap. If a woman is paid less than a man doing the same job and a new employer bases her pay on her prior salary, gender discrimination can be perpetuated, the bill's backers say. Last year, the state passed a weaker law that said prior compensation, by itself, cannot justify any disparity in compensation.