In this paper we aim to contribute to the debate on constitutional rules and their economic effects by extending the focus to the de jure-de facto constitutional gap. Firstly, we provide evidence that the size of this gap matters as non-compliance lowers the effectiveness of the constitutional commitment mechanism. Secondly, we identify several explanans of this gap, in particular relating to the democratization process, political conflict, age and comprehensiveness of the constitution. We base the conclusions on an empirical study for the unique setting of the post-socialist countries of Europe and Asia, which all enacted new constitutional frameworks after 1989, and argue that the constitutions in these countries acted primarily as blueprints.