I'd say that title goes to intelligence, which can't be trained so people are going to consistently have either a lot or a little their whole working life. Tech

I'd say that title goes to intelligence, which can't be trained so people are going to consistently have either a lot or a little their whole working life. Technology is progressively taking away the ability of low IQ people to do anything productive at all and giving it to a shrinking pool of people smart enough to do the remaining not-yet-automated things.