What does it mean for a financial market to be considered (a) Informationally efficient (b) Economically efficient?

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What does it mean for a financial market to be considered 

(a) Informationally efficient 

(b) Economically efficient?

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Related Book For  answer-question

CFIN

ISBN: 978-1305666870

5th edition

Authors: Scott Besley, Eugene Brigham

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