Answer: Private property.
Step-by-step explanation:
Rousseau considers that the emergence of private property is a significant cause of inequality in society. Rousseau is very critical of this phenomenon and considers it a source of his evil. Rousseau is an opponent of all forms of government that imply any inequality.
Rousseau distinguishes between natural disparities in which he enumerates different physical, age and intellectual capacities than human-made artificial ones.