I think Lion King's argument is that if the UBI is enough to live on with any degree of comfort, some people may be just fine living on that alone. Kind of the mythical welfare mother thing.
But there may be some truth to that.
Some people working two part time fast food jobs (or some other job that everyone hates) may decide they would rather not do that and only work one. And the person who is working just one of those jobs for a little extra family income may decide they no longer need to do that and stay home instead.
I don't think either of those cases are necessarily bad things, but they would effectively shrink the available workforce and thus reduce demand for those jobs. Which means the wages for those jobs would need to go up to make them more attractive. Consequently the price of those products/services would go up.
Bot another thing could happen:
Those low level fast food and retail jobs could go back to being filled by high school kids for the evening shifts. So you add teenagers back into the workforce because they are no longer competing with adults for crappy jobs.
Of course, this is all speculation.
But there may be some truth to that.
Some people working two part time fast food jobs (or some other job that everyone hates) may decide they would rather not do that and only work one. And the person who is working just one of those jobs for a little extra family income may decide they no longer need to do that and stay home instead.
I don't think either of those cases are necessarily bad things, but they would effectively shrink the available workforce and thus reduce demand for those jobs. Which means the wages for those jobs would need to go up to make them more attractive. Consequently the price of those products/services would go up.
Bot another thing could happen:
Those low level fast food and retail jobs could go back to being filled by high school kids for the evening shifts. So you add teenagers back into the workforce because they are no longer competing with adults for crappy jobs.
Of course, this is all speculation.