[i_dont_know_]

So, think of it this way.

If UBI was 40k/yr, and your current job gives you 80k/yr, suddenly you're... still making 80k/yr.

Only 40k of that is from your job and 40k is from just existing. Do you still want do your job with that much of a paycut? No? You're probably not alone there.

Tons of people would rather not do their job for such little money.

Suddenly, it falls on society to create meaningful jobs without coercing people with bankruptcy or starvation.