Editing Pacta sunt servanda (section)

== Modern jurisprudence ==
In both [[Civil law (legal system)|civil law]] and [[common law]] jurisdictions, the principle is related to the general principle of correct behavior in commerce, including the assumption of [[good faith]].<ref>{{Cite book |last=E. |first=Nedzel, Nadia |url=http://worldcat.org/oclc/1306381919 |title=A Comparative Study of Good Faith, Fair Dealing, and Precontractual Liability. |pages=98–99 |oclc=1306381919}}</ref> While most jurisdictions in the world have some form of good faith within their legal systems, there exists debate as to how good faith should be evaluated and measured.<ref>{{Cite journal |last=Mackaay |first=Ejan |date=2011 |title=Good Faith in Civil Law Systems – A Legal-Economic Analysis |url=http://dx.doi.org/10.2139/ssrn.1998924 |journal=SSRN Electronic Journal |pages=157–170 |doi=10.2139/ssrn.1998924 |s2cid=144021119 |issn=1556-5068|hdl=1866/18314 |hdl-access=free }}</ref> For example, in the United States—a common law jurisdiction—the implied duty of good faith and fair dealing exists in all commercial contracts.<ref>{{Cite web |last=Kelly |first=Catherine |date=July 26, 2016 |title=What You Should Know about the Implied Duty of Good Faith and Fair Dealing |url=https://www.americanbar.org/groups/litigation/committees/business-torts-unfair-competition/practice/2016/duty-of-good-faith-fair-dealing/ |url-status=live |archive-url=https://web.archive.org/web/20220402032333/https://www.americanbar.org/groups/litigation/committees/business-torts-unfair-competition/practice/2016/duty-of-good-faith-fair-dealing/ |archive-date=April 2, 2022 |access-date=June 16, 2022 |website=The American Bar Association}}</ref>