<![CDATA[As a significant developing nation in Southeast Asia with a vast population, Indonesia's economic stability is paramount to public welfare. However, the acceleration of globalization and technological advancements has intensified market competition, often leading to unfair business practices. Objective: This legal study examines the implementation and effectiveness of Law Number 5 of 1999 concerning the Prohibition of Monopolistic Practices and Unfair Business Competition. Specifically, it seeks to delineate various forms of monopolies, distinguishing between those that are detrimental to the public and those that may contribute positively to national welfare (legal monopolies). Method: This research employs a normative legal method with a statutory and conceptual approach. Results: The findings indicate that the implementation of Law No. 5 of 1999 requires further strengthening through regulatory updates and more rigorous law enforcement to preemptively address complex monopolistic trends. Furthermore, the effectiveness of the law is heavily dependent on enhanced inter-institutional coordination. Improving the supervisory climate is essential to ensuring legal certainty and maintaining a healthy, competitive business environment in Indonesia. Keywords: Legal Certainty, Monopolistic Practices, Unfair Business Competition, Law Enforcement, Indonesia.]]>
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