The three factors of production are thus Land, Labour, and Capital. Men are idle, earnestly wanting work, eager to provide their labour. Capital too lies idle, deteriorating by the day. Its owners would love to put it to use. So far as Labour and Capital are concerned, then, there need be no difficulty over supply.
Demand comes from previous production.
If people cannot supply, they cannot effectively demand. If people could work, they would create their own demand for others to work. Of course the problem is complex in its manifestations, and capable of endless dissection and extrusion. The fact that it exists throughout the globe, and appears in diverse political systems, cultures, and economies, all the way from the primitive rural to the highly developed urban, suggests that there is a fundamental, underlying cause. Because the problem does not lie with either Labour or Capital, it must lie with Land.