I agree that poverty is relative. So are our living conditions and understandings of the world. Comparing the modern to the medieval is useless. We are several paradigms ahead of that way of life. The stakes are different and the game has changed. What is "needed" to live a basic life requires more work now than at any other point in history. Where people had no money but just farmed before, now you MUST have money to buy the necessities of life because most of the world lives in urban areas.
The "haves" of our era have more than any other bourgeois in history. For the first time, the wealth of entire nations is held by non-government, private actors (see: the Federal Reserve, and the top 10 American corporations.) Not even the monarchies had to compete with that.
This has nothing to do with eliminating poverty. That can never be done. Many people choose to live what one might call an impoverished lifestyle. They don't want to be part of the system; just as some people choose to be homeless. This is about income disparity, where 1% of our people are holding 3/4 of the cards while tens of millions are come down on by the same system invented by these people.
I want to see FAIR application of the tax to EVERYONE. No loopholes. No lobbying government for bailouts. We either all play by the same rules or we don't.