David Turner, chair of the board of Commonwealth Bank, has declared his supported the four pillars policy that prevents mergers between the big major banks."Four pillars has served the country pretty well and continues to do so," Turner told The Australian. "Personally speaking, I am a free-market person and believe in free capital flows. I like healthy freedom." But Turner said the policy should be "locked in", and presumably endorsed by the Financial System Inquiry. Turner also ventured an insight on CBA's offshore expansion options."I think if there was a technology edge that we could develop that was applicable to our businesses outside of Australia, it would be quite a magical answer for us," he said. "Because we could take the technology and the business knowledge, and do it somewhere else."I'd love to see us do more, but it has to be within our capability and it has to be in an area in which we can add value for our own shareholders — otherwise all we do is end up paying out somebody else's shareholders and they might end up with a bigger smile than we end up with."