Definition of 'Blackboard Trading'
The buying and selling of commodities and futures contracts off of a blackboard found on the wall of a commodity exchange. Blackboard trading specialists hand wrote bids and offers on large chalkboards and when a matching price came up, the trade was executed.
Also called "posting," blackboard trading was too slow of a process to keep up with the volume of trades and began to be replaced by automated quote boards in 1969.
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