[sebastianz]

> If the people aren't there, wages will rise until they show up. [...] There is not, and never will be, a shortage of cleaners, for example, because anyone can do it, so as long as there are unemployed people and the wages are good enough, someone will do the work.

While this might be in a theoretical and pedantic way true, sometimes you do not have the economic context to provide those larger wages, so there will technically be no "shortage" - but just because the jobs themselves will disappear.

If you look at poor countries or regions, there is garbage, dirt and dilapidation everywhere. Clearly there is - in a practical way - a need for cleaners, but by your definition there is no "shortage" - because they cannot afford to pay anything for those jobs.