DIY Financial Advisor: A Simple Solution to Build and Protect Your Wealth

By Wesley R. Gray, Jack R. Vogel, and David P. Foulke

Quick Summary

An evidence-based argument that simple quantitative models consistently outperform human experts in investment decision-making. The authors develop a do-it-yourself investment framework built on equal-weight asset allocation, systematic risk management using moving averages and momentum, and value-plus-momentum security selection, demonstrating that individual investors following simple rules can beat the vast majority of professional financial advisors.

Executive Summary

"DIY Financial Advisor" is built on a powerful thesis from decision science: across 136 academic studies, simple quantitative models beat human experts in predictive accuracy the majority of the time. The authors extend this finding to investment management, arguing that individual investors using simple, systematic rules can achieve better results than most expensive professional advisors. The book is organized into two parts: Part One establishes why experts fail (cognitive biases, overconfidence, story-based thinking), and Part Two provides the specific models for do-it-yourself investing. These include the FACTS framework for evaluating advisors, an equal-weight asset allocation model, the ROBUST risk management system (using moving averages and time-series momentum), and value-plus-momentum security selection models. The companion website provides implementation tools.

Key Models

1. Equal-Weight Asset Allocation -- Simple equal weighting across asset classes outperforms complex optimization in most empirical tests
2. ROBUST Risk Management -- Combines total return momentum and moving average signals to systematically reduce exposure during market downturns
3. Value + Momentum Selection -- Combines value (cheap stocks) and momentum (trending stocks) for superior security selection

Critical Assessment

Strengths

• Strong academic foundation with extensive citations
• Practical, implementable models with specific rules
• Honest about limitations and potential failure modes
• Companion website with tools

Limitations

• The "simple models beat experts" thesis has nuances not fully explored
• Some backtested results may not persist out-of-sample
• Tax implications of systematic trading are not deeply addressed
• Requires discipline that many DIY investors may lack

Conclusion

Gray, Vogel, and Foulke provide a compelling, evidence-based case for systematic DIY investing. The book's greatest contribution is demonstrating that investment simplicity is not a concession but often a genuine advantage.