The Boglehead Approach

The Boglehead approach to investing is rooted in three main principles: investing in low-cost index funds, maintaining broad diversification, and focusing on the long-term. This philosophy encourages you to avoid chasing the latest investment fads or trying to time the market. Instead, you build a portfolio using widely diversified index funds that track the overall stock and bond markets, keeping investment costs as low as possible. By sticking to this simple strategy, you can capture the average market return, which historically has outperformed most actively managed funds over time.

A key element of the Boglehead philosophy is minimizing costs, especially through low expense ratios. The expense ratio is the annual fee a fund charges to manage your money, expressed as a percentage of your investment. Over long periods, even small differences in expense ratios can have a significant impact on your returns. The formula for the effect of expense ratios on your investment over time is:

Where:

• $r$ = annual return (as a decimal);
• $e$ = annual expense ratio (as a decimal);
• $n$ = number of years.

Keeping $e$ as low as possible ensures more of your money stays invested and compounding for your benefit.

Patience and simplicity are at the heart of the Boglehead approach. By selecting a few broad-market index funds and holding them for the long term, you avoid the stress and risk of frequent trading. This simple strategy reduces the likelihood of making costly mistakes based on emotions or market noise. Over time, patience allows your investments to grow through the power of compounding, while simplicity keeps your portfolio easy to manage and less expensive.