One only need look at Germany to refute the strange claim that a basic income would cause nobody to work. It is basically impossible to fall out of the lowest bracket of the German welfare system (~€350/mo for a childless single person, higher if you have kids), and yet Germany has high labor-force participation.

There is probably some level of income at which it would be true. If Germans got €5,000/mo, labor-force participation might be lower. But that is not what people are advocating.