The unconditional basic income guarantee is an interesting concept. Alongside the 100% inheritance tax, I think a system like this should be implemented as well, to spread the wealth more equally, and to eliminate poverty.
Here are some weblinks about Basic Income:
So, the idea of the Unconditional Basic Income is that the state guarantees every citizen's income at all times, no matter what the life situation of the citizen might be. So it is a "citizenship salary" of sorts.
You can read the linked articles for a more detailed description, but I'll copy paste the main points here:
1. It is paid to individuals, rather than households.
2. It is paid irrespective of any income from other sources.
3. It is paid without requiring the performance of any work or the willingness to accept a job if offered.
4. The size of basic income is comparable to minimum wage, which means it's high enough to live on.
So no matter what you do, you would always get your basic income once a month. And it's paid on top of all other income sources, which means that a person with a job gets his/her salary + basic income, while an unemployed person gets only basic income.
Also it doesn't matter how rich or poor you are, everyone automatically gets it as a basic citizenship right.
This is an interesting idea, and although it still has some "open questions", I think it's definitely worth considering as a solution to the various problems and inequality in our current system.