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1. A freely competitive market operating without restrictions: That painting might fetch a higher price on the open market.
2. The market for Treasury securities through which the Federal Reserve controls the money supply.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
a. a market in which prices are determined by supply and demand, there are no barriers to entry, and trading is not restricted to a specific area
b. (as modifier): open-market value.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
an unrestricted competitive market in which any buyer and seller is free to participate.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.