Style Research

John Authers

Active investment still has some active defenders, at least in the UK, to judge by the reaction to a recent Long View on the subject. And digging into the reasons for active funds’ persistent problems, it is easy to see why. Despite the claims of the Efficient Market Hypothesis (EMH) that it is impossible to beat the market other than by luck, it appears that an impressive number of managers do achieve the feat.

The problem is that they do not manage to beat the index by enough to be able to pay themselves and still pass on a decent performance to their clients. In other words, to quote Jack Bogle, the founder of Vanguard and the spiritual father of index investing, the case for passive investing rests on the CMH (Cost Matters Hypothesis), not the EMH.