History
The Core Four Portfolio emerged from the Bogleheads community in the 2000s as a practical evolution of the Three-Fund Portfolio. While the original Boglehead model focused on total market equities and bonds, many investors observed that listed real estate (REITs) behaves differently from broad equities and provides both income and inflation sensitivity. The addition of a dedicated REIT sleeve created a slightly richer diversification profile without introducing significant complexity. The portfolio reflects the broader shift in retail investing toward low-cost index funds, global diversification and disciplined asset allocation, all rooted in the philosophy popularized by John C. Bogle (1929–2019).
Philosophy
Keep the structure simple, but acknowledge that not all equities are the same. Global stocks provide long-term growth, bonds provide stability and rebalancing power, and REITs introduce exposure to real estate income and inflation-linked cash flows. The goal is not to maximize returns or optimize mathematically, but to build a portfolio that is easy to understand, easy to maintain and robust across different economic environments.