Of course, the first crown corporations were created far before I was born. Generally speaking, it allows them to operate in the areas for which they're responsible and to be able to react more easily to the particular circumstances of whatever market or business they're in, independent of the normal situations one finds in government. That's the overall situation. That's very general, I admit, but that's about as close as I can come to giving you a general rationale. Of course, individual corporations have specific reasons for their existence.
On May 28th, 2013. See this statement in context.