Dealer Inventory In Bond Markets

A bond dealer quotes both sides of the market to clients, and every trade it fills leaves it holding either more bonds or more cash than it wants. That leftover position is dealer inventory, and unlike an equity market maker turning over inventory thousands of times a day, a bond dealer in a less liquid issue might carry a position for days or weeks before finding the next natural buyer or seller.

Inventory is expensive to hold. It ties up balance sheet that post-crisis capital rules price explicitly, it exposes the dealer to interest-rate and credit moves overnight, and in a stressed market it can be hard to offload at any reasonable price. Dealers respond by skewing their quotes: a dealer already long a bond will bid lower and offer lower to encourage clients to buy from it and discourage more selling into it, nudging its inventory back toward flat.

This is also why bond market liquidity can evaporate fast in stress: when many dealers are already loaded up on the same side of the market, none of them wants more, and bid-ask spreads widen sharply until inventory clears or risk appetite returns. Regulatory capital charges since the financial crisis have made this effect stronger than it used to be, since carrying inventory now consumes a scarcer, more expensive resource than it did when dealer balance sheets were less tightly constrained.