> slavery and had to die so that humanity could progress. Slave labor is vastly less efficient than having serfs that can keep And the Roman empire had in larg

> slavery and had to die so that humanity could progress. Slave labor is vastly less efficient than having serfs that can keep And the Roman empire had in large part shifted to serfdom in its later periods as the supply of cheap slaved dried up. > That allowed producing more food with less workforce Also the population collapsing resulted in significant increase in per capita productivity (more land per person)