how is it a good point? it’s just communist nonsense.

here:

A takes 20 min when you do it (Good)

A takes 60 min when I do it. (Bad)

B takes 60 min when you do it. (Bad)

B takes 20 min when I do it. (Good)

So we are good and bad at different things.

You and I work separately.

You do your A (Good) & your B (Bad)

I do my A (Bad) & my B (Good).

We get 2A & 2B done in 80 min.

You and I work together.

You do your A (Good) & my A (Good)

I do my B (Good) & your B (Bad)

We get 2A & 2B done in 40 min.

You and I live in a Marxist regime.

You are assigned to B (Bad)

I am assigned to A (Bad)

We get 2A & 2B done in 120 min and then report to central authority +120 min.

See? Working together creates a comparative advantage. We make more stuff together, so we produce more, and everyone can have more, at a better a price, so quality of life goes up.

The professor pretended that an employee brings is good at A & B. Not true. The employee is good at A (Labor) but not at B (Marketing, Accounting, Organising).

Everyone loses when the employee does everything himself (A + B). Likewise when the employer does A + B, everyone loses. No comparative advantage.