It's caused by Private Monopoly.

That is the present system.

They have monopolized everything that it is possible to monopolize; they have got the whole earth, the minerals in the earth and the streams that water the earth.

The only reason they have not monopolized the daylight and the air is that it is not possible to do it.

If it were possible to construct huge gasometers and to draw together and compress within them the whole of the atmosphere, it would have been done long ago, and we should have been compelled to work for them in order to get money to buy air to breathe.