> 1) How many of these lazy people are there?
> 2) How much economic output is wasted by employers trying to filter these lazy people out of their workforce.
I am pretty lazy but I'm not lazy all the time. I don't think there exists such a classes of "lazy people" vs "non-lazy people". Laziness is a mood, a state. It can be altered by motivation. Income is one important motivator although arguably not the only one.
My point is, if we have welfare state with UBI, we will form in-groups and out-groups just as you describe. The taxes of all the "non-lazy” group will be unbearable high. You will hear choruses of complaints from them. They will resent those “lazy people”. Let’s add some other component like race, language or country of origin and you have society more divided than before. These are just a few of the unintended consequences I would see.
And 15k is hardly enough to sell this program politically. You can get that now on disability.
> You might quit your full time job, but you would probably find some part-time programming work you enjoyed to allow you to afford good snowboards
I can get by on a used snowboard. I could also steal on from one of those “non-lazy people” :)