Margaret Chen was three years into her first tenure-track position when she realized she had a problem.
She was everything a research university could want in a junior chemistry faculty member: meticulous, evidence-driven, relentlessly rigorous. She had spent seven years earning her Ph.D., then two more as a postdoc, building a career on the principle that you don’t accept a conclusion until the data forces you to. Her lab notebooks were immaculate. Her methodology sections were a thing of beauty.
Her 403(b) retirement account, on the other hand, was a mess of anxious guesses.
“I pick up my Fidelity statement, and I genuinely have no idea what I’m looking at,” she confided to a colleague over coffee. “I just clicked the ‘moderate growth’ option during onboarding because it sounded reasonable. I have no idea if it actually is.”
Margaret had been contributing faithfully — maxing her match, at least — but every time she thought about her investment choices, she felt a familiar frustration. In her lab, she never made decisions without evidence. Why was she doing exactly that with her retirement savings?
Why doesn’t investing work like science? she kept thinking. Why does this feel more like gambling than chemistry?
What Margaret didn’t yet know — and what many investors never discover — is that investing can be guided by science. There is a research-based approach to building wealth that has been tested, peer-reviewed, and verified across decades of market data. It’s called Evidence-Based Investing.
🐻 Professor Bear’s Top Takeaways
New to evidence-based investing? Here’s what to walk away with:
- Financial media confidence is mostly noise. The stock tips, hot predictions, and “exclusive insights” you hear on TV and social media are often not backed by evidence. Study after study demonstrates that most professional money managers fail to outperform simple, diversified portfolios over the long term.
- Evidence-Based Investing (EBI) treats your portfolio like a science experiment. EBI uses peer-reviewed academic research, historical data, and economic theory to guide every investment decision. If it hasn’t been rigorously tested across multiple datasets, it doesn’t make the cut.
- How your investments work together matters as much as which investments you pick. Nobel Prize-winning economist Harry Markowitz proved mathematically that diversification — spreading your money across different, carefully chosen asset classes — can reduce risk without sacrificing expected returns.
- Fees are a silent killer of long-term returns. A 1% annual fee might not sound like much, but compounded over a 30-year career, it can cost you tens of thousands of dollars. Low-cost investments consistently outperform high-fee alternatives within the same asset class.
The Illusion of Investment Expertise
Investing often seems complicated and unpredictable. Many believe success comes from instinct, luck, or outsmarting the market. We watch financial news anchors make confident predictions. We hear stories of investors who “beat the market” with a hot stock tip. We see advertisements promising exclusive insights that will unlock wealth.
But here is what decades of academic research have consistently shown: these approaches rarely work. Study after study demonstrates that most professional money managers fail to outperform simple, diversified portfolios over the long term.1 If the professionals can’t do it, what chance do individual investors have when they rely on hunches?
Evidence-Based Investing offers a different path—one grounded in research and disciplined decision-making rather than speculation and prediction.
What Is Evidence-Based Investing?
Evidence-Based Investing (EBI) is a structured framework for creating investment strategies and managing portfolios. It combines historical and present data, scientific theories, and our understanding of markets to inform decisions. The core philosophy is simple: investors should use an analytical approach – similar to the methods used in science – rather than relying on hunches or predictions.
Just as Margaret trained her students to form a hypothesis, test it rigorously, and let the data draw the conclusion, EBI champions a systematic approach that relies on decades of historical data and academic research to guide investment decisions. Findings aren’t accepted based on a single study; they must be peer-reviewed and verified across multiple datasets.
Sound familiar? It should. It’s the scientific method — applied to your retirement account.
The Nobel Prize-Winning Foundation
The cornerstone of Evidence-Based Investing is Modern Portfolio Theory (MPT), a groundbreaking investment framework developed by Harry Markowitz over 70 years ago. This work was so significant that it earned Markowitz a Nobel Prize and revolutionized how we think about investing.2
In simple terms, MPT demonstrates that investors can build optimal portfolios by understanding the relationship between risk and return. Instead of trying to pick “winning” stocks – a practice that research shows can be extremely difficult to do consistently – the goal is to create a portfolio that delivers the best possible returns for a specific level of risk.
This was revolutionary. Before Markowitz, investors focused primarily on finding individual securities they believed would outperform. Markowitz demonstrated mathematically that how investments work together matters as much as – or more than—how they perform individually.
For Margaret, a scientist who spent her days thinking about molecular interactions, the concept clicked immediately: it’s not just about the elements. It’s about how they combine.
The Key Principles
Evidence-Based Investing encompasses several core principles that work together to help investors achieve their financial goals:
Diversification: Don’t put all your eggs in one basket. By spreading investments across various carefully selected asset classes with different risk characteristics, investors can reduce overall portfolio risk without sacrificing expected return. Don’t put all your eggs in one basket — but be intentional about which baskets you choose.
Factor Investing: Academic research has identified characteristics – such as company size, value, and profitability – that can influence investment returns over long periods. EBI uses these “factors” systematically rather than speculating on individual stocks.
Cost Management: High fees can significantly reduce long-term returns. Research consistently shows that low-cost investments typically outperform their high-fee alternatives when using comparisons within the same asset class.3 There are many fees that are somewhat “hidden” from investors, as well.4
Disciplined Rebalancing: Regular portfolio adjustments help maintain your desired risk level — and implement a genuine “buy low, sell high” approach. This is the opposite of what many investors do emotionally, which is buy high (when markets are exciting) and sell low (when markets are scary).
Behavioral Discipline: Understanding and overcoming emotional biases that lead investors to make poor decisions – like panic selling during downturns. Ongoing education by a trusted financial and investment adviser, combined with a well-documented investment policy to guide future investment actions, can counter the behavioral biases that often wreck investment portfolio performance.
Margaret’s Discovery
When Margaret finally learned about Evidence-Based Investing, she had the feeling she always got when a complicated experiment suddenly made sense.
“This is exactly how I was trained to think,” she said. “Form a hypothesis based on theory. Test it thoroughly and repeatedly against data. Let the evidence guide your conclusions. Don’t fall in love with a result just because you want it to be true.”
She also learned something that surprised her about her own 403(b): she wasn’t necessarily stuck with her university’s default fund lineup. Depending on her plan’s rules, she might be eligible to move a portion of her accumulated balance into a self-directed brokerage account or roll over older funds into an IRA — giving her access to better investment options and lower-cost funds. She hadn’t known to ask.
For Margaret, the answer to her long-running frustration was finally clear: investing absolutely can work like science. The research exists. The evidence is compelling. And for investors willing to embrace a disciplined, research-based approach, the path forward is illuminated by decades of rigorous academic work.
The only question is whether you’re ready to stop guessing — and start investing like the scientist you already are.
Loved this? Sign up for our e-newsletter and be the first to receive new insights, downloads, and sneak previews of upcoming books.
About the Authors
This post originally appeared on ScholarFinancial.com as “What if Your Investments could be Guided by Science instead of Guesswork?”
Ron A. Rhoades, JD, CFP® is the founder of Professor Money Bear. He serves as an Associate Professor of Finance at the Gordon Ford College of Business, Western Kentucky University and a financial advisor at Scholar Financial, a practice within XY Investment Solutions LLC. With a background as both an attorney and a CERTIFIED FINANCIAL PLANNER™ professional, Ron is a nationally recognized authority on the fiduciary duties of financial advisors. His book – Beyond the Bear Necessities: Personal Finance for a Fulfilling Life – will be published in 2026.
Chris Brown, Ph.D., CFP® is a faculty member in the Department of Finance at the Gordon Ford College of Business, Western Kentucky University, and a financial advisor at Scholar Financial, a practice within XY Investment Solutions, LLC. He holds the CERTIFIED FINANCIAL PLANNER™ designation and a Ph.D. in Personal Financial Planning. His research and teaching focus is on behavioral finance, retirement planning, and evidence-based investment strategies.
This article is for educational purposes only. It should not be construed as financial, legal, tax, or investment advice, nor as a recommendation to implement any specific strategy, product, or investment. Consult with a qualified financial professional before making investment decisions.
- Even recent analysis supports this. See Amy C. Arnott, “The Myth of the Stock-Picker’s Market” Morningstar, Oct. 21, 2025, https://www.morningstar.com/stocks/myth-stock-pickers-market. ↩︎
- “Harry Markowitz.” UBS: Nobel Perspectives & Economic Views. https://www.ubs.com/microsites/nobel-perspectives/en/laureates/harry-markowitz.html ↩︎
- See the Securities and Exchance Commission’s Investor Bulletin: How Fees and Expenses Effect Your Investment Portfolio for a breakdown an example: https://www.sec.gov/investor/alerts/ib_fees_expenses.pdf ↩︎
- Fidelity. ”Beat hidden investment fees.” https://www.fidelity.com/learning-center/personal-finance/hidden-investment-fees ↩︎