(31)The Commission should conduct regular reviews of the legal and supervisory arrangements applicable to stock exchanges in Switzerland. Those reviews are without prejudice to the possibility of the Commission to undertake a specific review at any earlier time, where relevant developments make it necessary for the Commission to re-assess the equivalence granted by this Decision and, in particular, the progress made towards the establishment of a common institutional framework for existing and future agreements through which Switzerland participates in the Single Market of the Union. Any re-assessment could lead to the repeal of this Decision.