The lesson of Loki? Trade less

Tim Harford

The pages of the Financial Times are not usually a place for legends about ancient gods, but perhaps I can be indulged in sharing one with a lesson to teach us all.

More than a century ago, Odin, All-father, greatest of the Norse gods, went to his wayward fellow god Loki, and put him in charge of the stock market. Odin told Loki that he could do whatever he wanted, on condition that across each and every 30-year period, he ensured that the market would offer average annual returns between 7 and 11 per cent. If he flouted this rule, Odin would tie Loki under a serpent whose fangs would drip poison into Loki’s eyes from now until Ragnarök.

Loki is notoriously malevolent, and no doubt would love to take the wealth of retail investors and set it on fire, if he could. But when faced with such a — shall we say binding? — constraint, what damage could he really do? He could do plenty, says Andrew Hallam, author of Balance and other books about personal finance. Hallam uses the image of Loki as the malicious master of the market to warn us all against squandering the bounties of equity markets.

All Loki would have to do is ensure the market zigged and zagged around unpredictably. Sometimes it would deliver apparently endless bull runs. At other times it would plunge without mercy. It might alternate mini-booms and mini-crashes; it might trade sideways; it might repeat old patterns, or it might do something that seemed quite new. At every moment, the aim would be to trick investors into doing something rash.

None of that would deliver Loki’s goals if we humans weren’t so easy to fool. But we are. You can see the damage in numbers published by the investment research company Morningstar; last year it found a shortfall in annual returns of 1.7 percentage points between what investors make and the performance delivered by the funds in which they invested.

There is nothing strange about investors making a different return from the funds in which they invest. Fund returns are calculated on the basis of a lump-sum buy-and-hold investment. But even the most sober and sensible retail investor is likely to make regular payments, month by month or year by year. As a result, their returns will be different, maybe better and maybe worse.

The full article is available here. This article was published at Tim Harford.