Before agricultural society, the world was the collective property of mankind. Each person had a right to move wherever they pleased, to work where they liked, and to pull out of the earth what belonged to them.
Why would our ancestors would have given up their rights for nothing? Why would they trade their right to work the land in exchange for unemployment and poverty? Humanity no longer recognizes an individual's right to the land. Our governments have completely forgotten about it.
At one point, there was a person who decided to claim a piece of land as theirs permanently, to the exclusion of all others. This was encroaching upon the collective property right of all other people. But farmers were more productive than gatherers; those who started large plantations could afford to buy a military. Our ancestors' right to the land, then, was not traded -- it was taken from them, by brute force.
Those who came before you had more rights and lived in greater liberty. If the land was taken from them, then we still each possess a right to the earth. Property rights are hereditary; they pass on from generation to generation, as it had been for thousands of years with the earth's collective property.
There are too many advantages to industrialized society to revert back to hunters and gatherers. Modern medicine, as well as manufacturing and agriculture, have improved mankind's standard of living. Capitalism asserts that the land is the exclusive property of some few individuals -- and it generally happens that very few people own the majority of all land, no matter what country you examine.
We still have the right to the land -- to labor it and to benefit from it. So we need a social organization that fulfills that right but still maintains the benefits of industrial society. In the Capitalist system, there is plenty of land begging for industry, but it is all fenced in; there are many factories, but they are all idle. The land is definitely not being used to benefit the majority, to provide for all the people. Instead, it is running for the profit and privilege of a few, against the interests of the masses. To stop the tyranny of the few, we need an economy managed collectively by the people themselves.