Definition
Blackboard trading
The practice, no longer used, of selling commodities from a blackboard on a wall of a commodity exchange.
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Blackboard Trading
The practice, no longer used, of buying and selling commodities by posting prices on a blackboard on a wall of a commodity exchange.
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Blackboard Trading: The practice of selling commodities from a blackboard on a wall of a commodity exchange.
 See also: Black, Commodity, Exchange, Commodities, Trading
  
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