Actually, basic income does not encourage laziness (that's a common misconception based on our personal opinions which make sense from a certain point of view and from a confirmation bias). I'm currently researching basic income and the criticism that BI increases laziness is the most frequently repeated criticism for which I argue that it's invalid because it is based on personal opinion and not on fact.

Actual data and field experiments on basic income prove that people work more hours, that their income increases, that they visit hospitals on fewer occasions and that they spend money responsibly.

Sources: 1) http://www.dominionpaper.ca/articles/4100 -> Dauphin Canada, 1974-1978 experiment -> only mothers with newborns and teenagers worked less.

2) http://www.usbig.net/bigblog/2013/08/important-study-finds-t... -> BI receivers worked 17% more hours and their annual income after two and a half years was 50% higher (they invested mental resources into building their own businesses or looking for better paying jobs).

Also, allow me to argue that the system would work even if most people did not actually contribute anything. How many Linux users are there, vs. how many developers contributed source to the Linux project? Only a tiny, tiniest fragment of the world developer population actually got off their butts and did something for Linux, and the rest of the world sat by and "leeched" off their work. And yet, Linux thrives. My argument is that we still don't have real data about how many people in % need to be productive for the society to be sustainable and progressive. I believe we grossly overestimate the % of people who need to be productive.