How did Oliver Wendell Holmes, Jr. describe the marketplace of ideas?

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Oliver Wendell Holmes, Jr. described the marketplace of ideas by asserting that the most effective way to determine the truth is through the "power of the thought to get itself accepted in the competition of the market." He viewed this concept as a fundamental theory underlying the United States Constitution, emphasizing that the principle of freedom of speech requires protecting not only the ideas we agree with but also "freedom for the thought that we hate."1