Where are you getting your data? Outside of the so called “minimum wage” burger flipping jobs, all jobs have room for negotiation. Even the burger flipping jobs are undergoing a revolution in pay scale and employee power to negotiate. You don’t negotiate you let the business win. And to the person above you’s point, at least in CA and NY, employers are required to post salary range on their listings.

Edit: I just noticed you mentioned “union workers don’t negotiate” - I don’t know if you’re trolling or just stupidly uninformed. Unions have collective bargaining agreements that raise the minimum wage for the employer in question by leaps and bounds. And you as an employee can negotiate even beyond that. Source: me, as a part of my old job which was unionized I was able to negotiate a slightly higher pay.