Cap-weighted versus equal-weight indices tell an interesting story. Right now, the S&P 500's cap-weighted version is running circles around its equal-weight sibling—a gap that's built up quietly but unmistakably. The thing about these imbalances? History never lets them persist indefinitely. But here's what catches most traders off guard: the window usually stays open way longer than anyone wants to admit. Momentum has a habit of making early-bird contrarians look foolish before it finally validates them. Patience beats timing every single time.