Value investing: It's not about diversification

Is diversification the key to investing success?

Diversification provides safety in numbers and avoids the eggs-in-one-basket syndrome, so it protects the value of a portfolio.

But the masters of value investing have shown that diversification only serves to dilute returns.

If you are doing the value investing thing right, you are picking the right companies at the right prices, so there's no need to provide this extra insurance.

In fact, over-diversification only serves to dilute returns.

That said, perhaps diversification isn't a bad idea until you prove yourself a good value investor.

The point is that, somewhat counter to the conservative image, diversification per se is not a value investing technique.