This study analyzes the price adjustment clause in private contracts as a mechanism for preserving economic and financial balance in long-term contractual relationships. The initial section is dedicated to presenting fundamental concepts regarding currency and its functions, the inflationary phenomenon, and the emergence of the price adjustment clause in Brazil as an active management tool to address fluctuations in purchasing power. The legal limits and requirements for the validity of the price adjustment clause in civil and business contracts, consumer relations, as well as in agreements involving state-owned enterprises governed by Law No. 13.303/2016, are also examined. The study differentiates the price adjustment clause from other legal instruments, such as interest rates and pricing mechanisms in purchase and sale agreements. Finally, techniques and precautions to be observed in drafting the clause are presented, aiming to ensure the effective protection of the parties interests concerning pecuniary obligations. The study concludes that the appropriate use of this mechanism is essential for stability and credibility in contractual relationships, fostering a safer and more sustainable business environment.