• / Free eNewsletters & Magazine
  • / My Account
Home>Research & Insights>Investment Insights>The Cost Matters Hypothesis

Related Content

  1. Videos
  2. Articles
  1. Behind Morningstar's Economic Moat Rating

    Morningstar's Paul Larson outlines the five sources of wide economic moats, our research team's moat-rating process, and the performance of the Morningstar Wide Moat Focus Index.

  2. Wide Moat Focus Index Unfriends Facebook

    It's all aboard for CSX, among others, in the index's quarterly rebalancing.

  3. De Vaulx: There's Still Value in Japan

    After a nasty 25-year bear market, Japan is still far cheaper than both U.S. and European equities, despite its huge rally, says IVA CIO and portfolio manager Charles de Vaulx.

  4. De Vaulx: There's Still Value in Japan

    After a nasty 25-year bear market, Japan is still far cheaper than both U.S. and European equities, despite its huge rally, says IVA CIO and portfolio manager Charles de Vaulx.

The Cost Matters Hypothesis

While markets’ efficiency will be forever questioned, there is no question that the costs we incur in investing deduct directly from our returns--it’s simple subtraction.

Ben Johnson, 02/10/2016

A version of this article was published in the August 2015 issue of Morningstar ETFInvestor. Download a complimentary copy of ETFInvestor here.

In a 2003 contribution to CFA Magazine, [1] Vanguard founder and former CEO Jack Bogle introduced the cost matters hypothesis, or CMH. Bogle presented his theory as a substitute for the efficient-market hypothesis, or EMH, as a means of framing the task facing investors aspiring to beat the market:

We don't need the EMH to explain the dire odds that investors face in their quest to beat the stock market. We need only the CMH. Whether markets are efficient or inefficient, investors as a group must fall short of the market return by the amount of the costs they incur.

This same harsh math was elegantly laid out by William Sharpe in his seminal 1991 piece "The Arithmetic of Active Management" [2]:

If 'active' and 'passive' management styles are defined in sensible ways, it must be the case that

> before costs, the return on the average actively managed dollar will equal the return on the average passively managed dollar;

> after costs, the return on the average actively managed dollar will be less than the return on the average passively managed dollar.

These assertions will hold for any time period. Moreover, they depend only on the laws of addition, subtraction, multiplication and division. Nothing else is required.

Ben Johnson is Morningstar’s Director of European ETF Research.

blog comments powered by Disqus
Upcoming Events
Conferences
Webinars

©2014 Morningstar Advisor. All right reserved.