I'd go as far as saying that it is a liberal (in the sense classical liberal) idea.

Basic income recognizes the idea of a labor market, but admits that this market is neither pure nor perfect: the jobs seeker are in an unstable situation that they have to get out of to pay their bills.

Therefore the employer has an edge in the market.

By decoupling the revenu and the employment, the job seekers can make better decision for themselves.