The author is a little confused about the history of Libertarian thought on this issue. A minimum basic income (MBI) is NOT a social progressive concept first thought up by western social democrats but was originally a fundamental tenant of a flat tax system. Something Libertarian's have been arguing in favor of for a long time. The basic design is simple. You give every person a single dollar amount as a MBI and the…
Another effect that's probably more relevant for Hacker News readers, it doesn't dis-incentivize having your income be higher some years and lower on others. Very important for people considering founding startups, but also for people thinking about pursuing more education.
A progressive tax system that enabled either (a) recognize income for tax purposes in advance receiving it, or (b) deferring recieved in year t+1 that is much greater than in year t for tax purposes would do the same thing, without being a massive tax break (compared to existing progressive systems) to those who make large incomes year-after-year consistently.