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English definition of “efficient market”

efficient market

noun [S]
 
 
ECONOMICS
a market where all the important information is available to everybody involved at the same time, and prices change immediately according to this information: In an efficient market, prices reflect all available information, and so past prices can tell you nothing useful about whether future prices will go up or down.
(Definition of efficient market from the Cambridge Business English Dictionary © Cambridge University Press)
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