Because wealth that someone possesses can not be possessed by another person. If one person has 99% of all money in the world, everybody else will have to less

Because wealth that someone possesses can not be possessed by another person. If one person has 99% of all money in the world, everybody else will have to less to live on. The one person will be able to buy anything else on the world -- thus depleting the others. Or another scenario: Because money is hoarded in few hands, the value of the money goes down ... thus everybody else will loose their wealth. Things are of course more complicated. But it is a fact, that the resources of the world are limited. Thus if few people hoard things, the others have less ... this effect might come sooner or later, but it will come.