Talking out of Buridan's ass
A positive right, on the other hand, is the right to have something given to you, something that is not legally yours should become legally yours. So a positive right to property would be the right to have property provided for you. In conceptualizing a just society, which is the task of political philosophy, we have to figure out how to balance positive and negative rights so as to maximize justice and minimize injustice.
It seems to me that there are three issues regarding this which, together, make it impossible for any society to be just, except that it justifies by cynicism towards politics in general.