agreed. the "lump of labour" fallacy is a thing -- the idea that there are always more bodies and that it's trivially easy to hire, train / get up to speed, and work them.

in practice hiring and firing is expensive and often very risky. Bjorn the office worker may now be redundant and have a room temperature IQ but he's shown he'll show up on time, sober, and is liked by his coworkers enough, so throwing $5k to retrain him may be a far, far smarter investment then blowing $7k to hire a rando for another position...