Standard diversification dogma

The strategy we've adopted precludes us from following standard diversification dogma. Many pundits would therefore say our strategy must be riskier than that employed by more conventional investors. We disagree. We believe that a policy of portfolio concentration may well decrease risk if it raises, as it should, both the intensity with which an investor thinks about a business and the comfort level he must feel with its economic characteristics before buying into it.

- Warren Buffett