Milton Friedman proposed a sort of universal basic income as part of Nixon's plans to overhaul the welfare system. Friedrich Hayek made supportive comments. The FairTax, a national sales tax proposal, has a sort of universal basic income in its "prebate" scheme. It's actually an idea that has been circling amongst some libertarians for decades, the idea being that you replace the myriad welfare programs, a complicated tax code with loop holes and social engineering incentives, and the massive bureaucracy that administers all of that with a single payment.