Hmm, I'd never thought about that angle,but I guess it makes sense.
No word on if they are allowed to use Equifax, etc to pull salary data from?
EDIT: looking at the bill it looks like querying Equifax is probably also prohibited
> (b) An employer shall not, orally or in writing, personally or through an agent, seek salary history information, including compensation and benefits, about an applicant for employment.
As a side note one of the biggest issues macro economists have is that its very hard to prove their theories as you often can't run huge macro economic experiments.....
> Delaware, Massachusetts and Oregon have passed similar laws that take effect later this year or next, said attorney Ben Ebbink of Fisher & Phillips in Sacramento. Philadelphia passed one that was supposed to take effect in May but is being challenged in court. New York City and San Francisco have similar ordinances that take effect Oct. 31 and July 1, respectively.
With the number of states introducing legislation like this it will be interesting to see if you can tease out any state or city based GDP growth/shrinking based on these laws.