This assumes people on basic income without jobs are idle. What about stay-at-home spouses and parents? What about community volunteers? What about people who take care of sick friends and relatives?

Furthermore, what is the economic benefit of the activities listed above? What would be lost if those activities were either abandoned or required to be paid at a fair market price? I know, charging grandma by the hour is a silly idea, but I say so to illustrate the benefits to society by activities not reflected in GDP, and to invite discussion about whether society would be better served by individuals living on basic income alone who spend their time helping others, without having to worry about making next month's rent.