In the latest installment of Forbes’ Intelligent Investing, indexing guru Rob Arnott talks about the notion of fundamental indexing, and why he thinks it’s a much better system than typical market-cap-weighted indexing. Arnott also talks about the “3-D Hurricane” he sees hitting the U.S. — deficits, debt, and demographics — and why he thinks coming inflation means investors need to think of a “third pillar” of assets beyond stocks and bonds.