Do we have a duty to help the poor? How do we quantify that?

[Spooky]

With regard to the latter, Our Lord advised the rich young man to sell all his things and give the proceeds to the poor. This was not the rich young man's duty, but it was an act that Our Lord saw as being necessary for the rich young man's perfection

This is an interesting point, I've never thought about it in this way before. Perhaps Our Lord knew that wealth was dooming this person and knew if he didn't give it up, he would end up in Hell.