সামাজিক চুক্তি তত্ত্বটির উদ্ভাবক কে ?
Social contract arguments typically posit that individuals have consented, either explicitly or tacitly, to surrender some of their freedoms and submit to the authority of the ruler (or to the decision of a majority) in exchange for protection of their remaining rights. The relation between natural and legal rights is often a topic of social contract theory. The term takes its name from "The Social Contract" (French: "Du contrat social ou Principes du droit politique"), a 1762 book by Jean-Jacques Rousseau that discussed this concept. Although the antecedents of social contract theory are found in antiquity, in Greek and Stoic philosophy and Roman and Canon Law, the heyday of the social contract was the mid-17th to early 19th centuries, when it emerged as the leading doctrine of political legitimacy. 
Jean-Jacques Rousseau