Auction vs dealer markets — how do they compare on cost and transparency?

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AcadiFi · Accepted Answer

Auction markets match buyers directly with sellers, with price set by competitive bidding — dealers or market makers may provide liquidity but the match is between public orders. Dealer markets have dealers as intermediaries who always stand ready to buy and sell from their own inventory at quoted bid/ask prices; customers do not trade directly with each other. Example — auction: When Orient Pacific Bank shares trade on the ASX, a buy order at $16.42 matches a sell order at $16.42 directly; the exchange charges a modest fee. Spreads narrow to pennies in liquid names. Example — dealer: The USD/ZAR currency pair trades OTC; a buyer requests a quote from Citadel FX, which quotes 18.4210/18.4240. The buyer lifts the offer at 18.4240; the dealer is the counterparty. The 3-pip spread is the dealer's revenue. Why the asymmetry? Equities are standardized with many active buyers and sellers — auction works. Bonds have thousands of CUSIPs, each trading infrequently; dealer inventories bridge the time gap between natural buyers and sellers. Dealer markets offer immediacy at the cost of spread; auction markets offer tight spreads at the cost of requiring two-sided interest to clear. Market-quality implications: auction markets tend to be more transparent (public order book) while dealer markets show only dealer quotes with hidden inventory — leading to TRACE and MiFID II rules that force post-trade reporting in fixed income.

Auction vs dealer markets — how do they compare on cost and transparency?

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