Posted June 19, 2015
You are right and I oversimplified the matter for the sake of making an argument that it is the value/importance given to a treaty that gives it precedence and not the time when it was signed. In more technical terms, what you are referring to is known as dualism and you can read more about it here. It differs from country to country and I imagine bigger states such as France and Germany are more on the dualism side, while countries like Belgium are a famous monist example.