Those looking to take the Warren Buffett approach to investing may consider buying index funds that track total market indices around the globe. That’s about as close to true diversification as one can get.Clearly, Buffett’s long-range view is borne out by the market’s history.“Diversified portfolios still prevail over the long term… if those investors with highly diversified portfolios had abandoned that approach during the bull market of the 1990s, they would have earned lower long-term returns and have s ...