Don and Tom tackle the timeless topic of diversification — why it’s back in style, why it’s so hard to maintain, and why most investors (and pros) still get it wrong. They walk through how market “leadership” shifts over decades, the global vs. U.S. split, and why comparing your portfolio to the S&P 500 is often a trap. Listener questions cover ETF access at T. Rowe Price and Vanguard, whether to invest or pay down debt, and how the 5% flexible withdrawal rule works in early retirement. P...