Making the MarketTo lubricate their transactions, market makers need a supply, or inventory of the securities they support. This can either be real certificates, or via a process called 'stock lending' (don't worry about THAT one yet - it basically means they borrow stock or "pretend" they have it). Once you have an inventory of stock, and the concept of 'spread' (or 'edge'), a marvelous opportunity opens up. The average price at which a market maker accumulates a security and the average price at which he distributes it are going to be different. Add this to the fact that the market maker sets the price tick by tick, and boom! A license to print money. Observe closely, this is a good trick. [More] |
