I'm not too sure. In my experience, salary negotiations will earn you a few percentage points at most. It does make it easier for a potential employee to decide

I'm not too sure. In my experience, salary negotiations will earn you a few percentage points at most. It does make it easier for a potential employee to decide between two companies (this is what the other company offered, can you match it?), but it's a relatively small number compared to difference in promotion level and team. If we're talking about software engineering, these positions tend to have 5 or so levels plus different teams. Salary is tied to team and level. I don't think what Ellen is doing will directly make a huge impact on the gender gap because the problem in software engineering is more about underrepresentation of women. Perhaps what it will do is prevent a problem where all or most of the men in the same position were being just a wee bit more than the women at Reddit, which seems like a believable situation.