My opinion is that transportaion and warehouse jobs have been progressively underpaid until now those jobs are at subsistance levels and not worth the effort. The entire middle class has been strangled for the benefit of the richest. Yes supply, demand and Covid have a role in the shortagex but global economies have reached an inflection point. Why don't truckers work, rich people ask with no knowledge of the actual take home pay of the trucker. Its a job that giveth and taketh away by ~ half. To fix the problem employers and owners will have to give back.