Abstract
This article aims to analyze the types and nature of institutional changes in the European Union’s political system, as well as the legal conditions for these changes. The analysis will begin with an identification of the various types of institutional changes occurring in the EU’s political system and their nature. The most significant type of institutional change is the amendment of the founding treaties. However, this is merely the beginning of an ongoing process of institutional change resulting from the specific nature of treaty amendments. To understand the mechanism of institutional change, the founding and revision treaties must be recognised as incomplete contracts that are essentially filled with content only at the stage of their implementation within the framework of interinstitutional relations. This results in uncertainty as to the final content of the adopted solutions. The nature of European Union law is of fundamental importance to the concept of treaties as incomplete contracts.
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