Well the title is a bit of an overstatement!
This post is actually just a short note with a link to a document which covers the concept of specialness in the repo market, and which is actually a good description of the repo market as a whole. Such things are hard to find, you know.
Click here for the doc (this is an article called ‘Special Repo Rates: An Introduction’ by Mark Fisher, published in vol 87 (2) of Economic Review 2002).
Thanks! Excited to read this 🙂