One thing is running an experiment in a small place for a short time, with a small amount of money being given.
Plenty countries to look at who do very well with different kinds of social assistance and minimum income. Of course all those countries don't spend 15% of their budget (actually roughly half of discretionary spending) on 'defense'. Which really is a form of social assistance as well at this point in the USA. In 2017 142.5 million US citizens were employed by the US military (1.3 million active duty members). That's the biggest social employment scheme ever seen.