There can be practical shortages - there can just literally not be enough people in the area to do the jobs. Saying “it’s not a shortage because you could buy the Yankees and pay the players $millions to assemble widgets” isn’t very informative.
There always seems to be a shortage of people willing to work for little never a shortage of people wanting the CEO's jobs
That doesn't really cover the current situation. In the US 7 million or so fewer people are employed than pre-covid. Wages haven't gone down so they can't explain the change.
Something else has changed for these 7 million people.
If you take what unemployment defines are qualification.. many able body people could perform those tasks if all CEOs decided to move to other careers.
Salaries increase because qualifications increase creating scarcity which benefit the people who create scarcity. If the hiring guidelines say only CEOs can be CEO prices goes up for CEOs, VPs and anyone in charge of making the rules.