Originally Posted by aquinas
different industries and professions have different productivities, requiring a different labour mix.
The video mentioned industries, not professions. Industries are different than professions. Industries contain a large cross-section of professions, a broad array of qualifications and post-secondary education.

Some may say there is continuous scope creep with you introducing regions, professions, and other items which were not a part the video, rather than discussing what was actually said in the video.