Going off of productivity has a lot of gotchas, I'd go for tracking purchasing power for non-imported goods like housing for the zip code that the job is located in. There might be some interesting side effects to that. Pushing businesses into poor areas, which should have a positive effect on society as a whole to get money coming into those areas without handouts or mandates. It'd be a fun experiment to run.

I see zero arguments against pegging the minimum wage to $12 an hour in 2021, maybe a tad more to offset years of what amounts to theft from worker's pockets. People on one hand will badmouth those on welfare, and then turn around and not want to reward those that go to work either. Those two together never sat well with me. Seems like people are just envious, bitter creatures all around.