What it means
Most people picture a market as an auction where orders meet each other on a central order book. Many of the world's largest markets do not work that way, because government and corporate bonds, foreign exchange and much over-the-counter derivatives trading run through networks of dealers who stand ready to take the other side of a trade.
What the dealer supplies is immediacy, and that is the service being paid for. If you want to sell $5,000,000 of a bond that trades a few times a week, you do not have to wait for a natural buyer to appear, because a dealer will take it onto their own book and carry the risk of holding it until they can move it on.
That inventory risk is real and it determines the spread. A dealer holding bonds overnight can be hurt by a rate move, so spreads widen for illiquid instruments, large sizes and volatile conditions, and in a crisis dealers can simply stop quoting altogether.
Price discovery is weaker than on an exchange, because quotes are bilateral and not always published. Regulators have pushed for more post-trade transparency, but a buyer in a dealer market still benefits enormously from asking several dealers for a price rather than accepting the first one offered.
For corporate treasurers this is everyday reality rather than theory. Issuing commercial paper, hedging a currency exposure or buying short-term instruments almost always means transacting with a dealer, and the spread is a genuine cost that never appears as a separate line on any invoice.
In practice
Real-world examples.
Example
A pension fund wants to sell a $12,000,000 holding in a thinly traded corporate bond. No exchange order book exists for it, so the fund asks four dealers for a bid, receives quotes ranging from 96.80 to 97.35, and sells at the best price, capturing $66,000 more than it would have taken from the first dealer it called.
Example
An importer needs to buy euros to pay a supplier. Its bank quotes a rate that already includes a margin over the interbank price, and because foreign exchange is a dealer market rather than an exchange, the importer has no visible central price to compare against unless it requests competing quotes.
Example
A wealth manager buying municipal bonds for a client finds the same bond offered at meaningfully different prices by three dealers on the same afternoon. The variation reflects each dealer's existing inventory and appetite rather than any new information, which is a characteristic feature of dealer markets.
Formula
Calculation
Bid-ask spread = Ask price - Bid price, and Round-trip cost = Spread x Face value traded
A dealer quotes a corporate bond at 99.50 bid and 99.75 ask, both expressed as a percentage of face value. The spread is 99.75 - 99.50 = 0.25 points, or 0.25% of face value.
A treasurer buys $2,000,000 of face value at the ask: $2,000,000 x 99.75% = $1,995,000. If she had to sell the position straight back at the bid, she would receive $2,000,000 x 99.50% = $1,990,000.
The round-trip cost is $1,995,000 - $1,990,000 = $5,000, which is the dealer's gross compensation before hedging costs and inventory risk.
Now suppose she asks two more dealers and the best offer comes back at 99.70 rather than 99.75. The saving on the purchase alone is $2,000,000 x 0.05% = $1,000, which is a 20% reduction in the cost of the trade for the price of two phone calls.Case study
Seen in the real world.
Trenholm Mutual is a fictional insurance company used purely as an illustrative example. Its investment team traditionally placed all its corporate bond orders with a single dealer with whom it had a long relationship, on the view that loyalty earned better pricing.
An internal review compared 60 trades over a year against the prices reported after each trade settled. On average the firm had paid about 0.18 points more than the best available level, which on roughly $340,000,000 of annual turnover came to around $612,000 a year.
In this illustrative scenario the team introduced a simple rule: any trade above $1,000,000 must be shown to at least three dealers. The relationship with the original dealer survived, the measured cost fell by more than half in the following year, and the reporting pack gained a single line showing execution quality against the best quote received.
Watch out
Common mistakes.
- Assuming the quoted price in a dealer market is a market price, when it is one dealer's price given their inventory and appetite at that moment.
- Treating the spread as free because it is not itemised as a commission, when it is usually the largest cost of the trade.
- Judging a bond portfolio's value using the ask price, which overstates what could actually be realised if the holdings were sold.
Questions
People also ask.
How is a dealer market different from a broker market?
A dealer trades from their own inventory and is your counterparty, whereas a broker acts as an agent, finds someone else to take the other side and charges a commission.
Why do bonds trade this way rather than on an exchange?
A single issuer may have dozens of separate bonds, each trading rarely, so there is not enough continuous interest in any one of them to support a central order book.
How can a buyer reduce the cost?
Request competing quotes, trade in sizes that dealers find easy to handle, avoid trading in volatile conditions or at the end of the day, and check executed prices against reported trade data afterwards.
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