What is a repo?

In a Nutshell: A repo, or repurchase agreement, and its close relation the sell/buy-back[1], is a way of borrowing government bonds.

Structure': Repos are structured as a spot DVP sale at market, and a later DVP repurchase, also at market, of the same securities (hence, “repurchase”). In any case there is always a cash leg — by which the “Buyer” pays for the govvies — and a securities leg — by which the Seller delivers them. Contrast that with a stock loan where both the Loan and the Collateral leg are physical settlements of securities.

Term: Repo trades are usually very short term, typically overnight.

Reverse repo: a reverse repo is just a repo from the point of view of the buyer. The Buyer buys and agrees to sell back later; the Seller sells and agrees to buy back later.