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Brian Romanchuk — Defining Market Efficiency Properly

Summary:
The concept of market efficiency has attracted a considerable amount of debate over the decades. The issue is that the definition is problematic; efficiency is more an attribute of the investors in the market, rather than the market itself. If we turn the focus to the role of investors, most of the mysteries associated with the concept evaporate. (Note: This article is in a preliminary state. I started thinking about how to write up the role of market efficiency in the context of breakeven inflation rates. I realised that I was unhappy with the existing definitions used, and this article represents my initial thoughts on the matter. It is quite possible that I will again revise my thinking.) Bond Economics Defining Market Efficiency ProperlyBrian Romanchuk

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The concept of market efficiency has attracted a considerable amount of debate over the decades. The issue is that the definition is problematic; efficiency is more an attribute of the investors in the market, rather than the market itself. If we turn the focus to the role of investors, most of the mysteries associated with the concept evaporate.
(Note: This article is in a preliminary state. I started thinking about how to write up the role of market efficiency in the context of breakeven inflation rates. I realised that I was unhappy with the existing definitions used, and this article represents my initial thoughts on the matter. It is quite possible that I will again revise my thinking.)
Bond Economics
Defining Market Efficiency Properly
Brian Romanchuk
Mike Norman
Mike Norman is an economist and veteran trader whose career has spanned over 30 years on Wall Street. He is a former member and trader on the CME, NYMEX, COMEX and NYFE and he managed money for one of the largest hedge funds and ran a prop trading desk for Credit Suisse.

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