Only if those 40 year olds believe they're entitled to higher pay just because they're older. The number of available jobs in a given career hierarchy shrinks pretty quickly as you ascend, which means that most people won't rise very far. Start at the bottom rung, stay at the bottom rung for the rest of their life.
My mother lost her job as a factory worker (bottom rung) when Samsung stopped manufacturing CRTs in Germany. She was 50 at the time and retrained as a call center agent, working for the same pay as 22 year olds. She kept working there until her retirement, while new 22 year olds had to be trained every few months because they hadn't yet learned how to hold down a job. Talk about "out-competed".
> Even more than that, shifting X00,000 people from one career to another would flood the labor market and destroy wages. The whole thing makes literally no sense.
Only if they all retrain for the same job. Spread it over all industries that have room for growth and the effect becomes much less catastrophic.