The Graham value investing system can outperform the market over the long term, but only if the investor can do the significant work required to implement the four Graham value investing principles: (1) value shares like a proportional interest in a business, (2) have a margin of safety when purchasing shares, (3) understand Mr. Market is bipolar rather than wise and should be your servant not your master, and (4) be rational. The fourth principle is the hardest of all for investors.
