Land Value Tax.<p>I think this is the next big thing after basic income (especially when the question of how to pay for basic income comes up).<p>The land value tax is universally seen by economists as the most fair tax, yet for whatever reason we continue to ignore it in favor of income, sales, and property taxes - all of which distort markets (unlike the land value tax).<p>The lack of research and real life case studies on this topic is a huge obstacle to this entering the mainstream.