> I've never understood the exact differences between basic income and social security,
The difference is that everybody gets basic income, and not just the unemployed. You don't get a sharp division between the employed and the unemployed, your welfare won't get cut when you start earning money. Work is always rewarded, and it's easier to get out of the poverty trap.
And for the countries that have already got welfare, the argument of "But nobody is going to work!" is already out the window. If that were a real problem, everybody would already be on welfare.
Yes there are people that abuse it. The vast majority doesn't. Even if it's just because they couldn't look their friends in the eye if they did.
The difference is that everybody gets basic income, and not just the unemployed. You don't get a sharp division between the employed and the unemployed, your welfare won't get cut when you start earning money. Work is always rewarded, and it's easier to get out of the poverty trap.