Register For Our Mailing List

Register to receive our free weekly newsletter including editorials.

Home / 405

Five timeless lessons from a life in investing

US businessman, investor and philanthropist David Booth, who founded global asset management firm Dimensional Fund Advisors 40 years ago, has brought together five timeless lessons from his decades in the finance industry.

Dimensional, which manages about $850 billion globally, is closely linked to several Nobel laureates in economics, including Merton Miller, Eugene Fama, Robert Merton and Myron Scholes. 

Here are his five lessons for investors.

Lesson 1: Gambling is not investing, and investing is not gambling

Gambling is a short-term bet. If you treat the market like a casino, and you’re picking stocks or timing the market, you need to be right twice - in an aim to buy low and sell high. Professor Fama showed that it’s unlikely for any individual to be able to pick the right stock at the right time, especially more than once.

Investing, on the other hand, is long term. While all investments have risk, there are things you can do as a long-term investor to manage those risks and be prepared. As Nobel laureate Merton Miller said, “Diversification is your buddy.” Investing is buying a little bit of almost every company and holding them for a long time. The only bet you’re making is on human ingenuity to find productive solutions to the world’s problems.

Lesson 2: Embrace uncertainty

Over the past 100 years, the US stock market, as measured by the S&P 500, has returned a little over 10% on average per year but hardly ever close to 10% in any given year. The same is true of dozens of other markets around the world that have delivered strong long-term average returns.

Stock market behaviour is uncertain, just like most things in our lives. None of us can make uncertainty disappear but dealing thoughtfully with uncertainty can make a huge difference in our investment returns, and even more importantly, our quality of life.

The way to deal with uncertainty is to prepare for it. Without uncertainty, there would be no opportunity to do better than a relatively riskless return like that from a money market fund. We always emphasise that risk and expected returns are related, which means you can’t have more of one without more of the other. Make the best-informed choices you can, then monitor performance and make portfolio adjustments as necessary.

Come up with a plan to get back on track in case things don’t go as expected. And remember, you can’t control markets, so don’t blame yourself for results outside your control. Try to relax knowing you’ve made the best-informed choices you can. A trusted financial adviser, a fiduciary who puts your interests first can help you cultivate this sort of discipline and long-term perspective.

Lesson 3: Implementation is the art of financial science

I was compelled to approach investing differently by the research Fama and other leading academics were doing to better understand markets and returns. There’s general agreement on what financial science tells us, yet so much can be gained or lost in application. Just as some sports teams can consistently execute their strategies better than others, investment professionals can consistently add value by dealing better with market mechanics.

Bob Merton and Myron Scholes were recognised as Nobel laureates for their options-pricing model, which shows that flexibility has value. Great implementation requires paying attention to detail, applying judgment, and being flexible.

Lesson 4: Tune out the noise

If an investment sounds too good to be true, it probably is. When people ask me if I’m investing in the latest shiny investment idea, I tell them, “If I don’t understand something, I don’t invest in it.” That’s because I’ve seen a lot of fads come and go.

TV pundits handing out stock tips? Friends letting friends in on their next big investment? I see these more as entertainment than information.

Stress is induced when people think that they can time markets or find the next winning stock, or that they can hire people who can. There is no compelling evidence that professional stock pickers can consistently beat the markets. Even after one outperforms, it’s difficult to determine whether a manager was skilful or lucky.

The good news is you can still do well without having to find what markets might have missed. While markets are unpredictable and may even seem chaotic at times, they have an underlying order. Buyers and sellers come together and trade, which is the activity that sets market prices. Unless each side agrees to a price, they don’t trade.

New information and expectations about returns are quickly incorporated. Consistently finding big winners is difficult, but everybody can have access to the expected returns that a diversified, low-cost portfolio can generate.

Lesson 5: Have a philosophy you can stick with

It can be difficult to stay the investment course during periods of extreme market volatility. At the end of March 2020, the S&P 500 was down nearly 20% for the year. Record amounts of money exited from equity mutual funds and went into money market accounts. Those investors who stayed out of the equity market missed out on the subsequent 56% gain in the S&P 500 over the next 12 months. We will all remember 2020 for the rest of our lives. It serves as an example of how important it is to maintain discipline and stick to your plan.

By learning to embrace uncertainty, you can also focus more on controlling what you can control. You can make an impact on how much you earn, how much you spend, how much you save, and how much risk you take. This is where a professional you trust can really help. Discipline applied over a lifetime can have a powerful impact.

 

David Booth founded global asset management firm Dimensional Fund Advisors 40 years ago this year. He was a Research Assistant at the University of Chicago Graduate School of Business, which was renamed the Booth School in 2008 after a $300 million pledge from the Booth family.

 

7 Comments
Mohan
May 05, 2021

Great article and timely advise to not get carried away

MB
May 01, 2021

How many timeless principles have you read in your life? Too many!
How many failed ‘investors’ have you met in your life? Too many!
It’s not about what you know but what you do. It’s not an intellectual issue, it’s emotional issue and that’s how it needs to be approached.
Therefore, the only principle you need to stick with is finding a third-party investor behaviour coach who will guide you and stick to their advice for the rest if your life.
You’re welcome.

Foz
May 03, 2021

That's some handsome advice. Graham - what are you thoughts on dollar cost averaging in relation to lessons 2, 4 and 5? Useful or are their better tools?

Jo
June 03, 2021

https://www.morningstar.com.au/Video/dollar-cost-averaging-doesn39t-work/197515
Why dollar cost averaging doesn't work.

Damien Parker
May 01, 2021

Great article and brilliant ‘touchstones’ but somewhat mystical when not backed up by greater detail when not followed by the ‘which means that’. This is where mere mortals like myself learn how to practically apply the touchstones.

phil eley
April 28, 2021

re lesson No 5 . How many times have we seen over (my) 35 years as an adviser- markets fall and then substantially rebound next year. We remind clients when things are booming to consider isolating a few years of their income needs now when things are going well so they are prepared for the inevitable fall. it also fends off those who think we should have seen it coming..... as I remind them - were not that good, otherwise, we would be retired in the Bahamas knowing when to get in and out. Great article guys

Mart
April 28, 2021

David (and Graham) - thank you, this is one of the best articles I have read on Firstlinks as it very simply and really concisely summarises "what to do" (and what not to do). Fabulous. I shall be printing it off and blue-tacking it to the inside of my eyelids !

 

Leave a Comment:

RELATED ARTICLES

Are more informed investors prone to making poorer decisions?

The iron law of building wealth

The 9 most important things I've learned about investing over 40 years

banner

Most viewed in recent weeks

16 ASX stocks to buy and hold forever, updated

This time last year, I highlighted 16 ASX stocks that investors could own indefinitely. One year on, I look at whether there should be any changes to the list of stocks as well as which companies are worth buying now. 

UniSuper’s boss flags a potential correction ahead

The CIO of Australia’s fourth largest super fund by assets, John Pearce, suggests the odds favour a flat year for markets, with the possibility of a correction of 10% or more. However, he’ll use any dip as a buying opportunity.

2025-26 super thresholds – key changes and implications

The ABS recently released figures which are used to determine key superannuation rates and thresholds that will apply from 1 July 2025. This outlines the rates and thresholds that are changing and those that aren’t.  

Is Gen X ready for retirement?

With the arrival of the new year, the first members of ‘Generation X’ turned 60, marking the start of the MTV generation’s collective journey towards retirement. Are Gen Xers and our retirement system ready for the transition?

Why the $5.4 trillion wealth transfer is a generational tragedy

The intergenerational wealth transfer, largely driven by a housing boom, exacerbates economic inequality, stifles productivity, and impedes social mobility. Solutions lie in addressing the housing problem, not taxing wealth.

What Warren Buffett isn’t saying speaks volumes

Warren Buffett's annual shareholder letter has been fixture for avid investors for decades. In his latest letter, Buffett is reticent on many key topics, but his actions rather than words are sending clear signals to investors.

Latest Updates

Investing

Designing a life, with money to spare

Are you living your life by default or by design? It strikes me that many people are doing the former and living according to others’ expectations of them, leading to poor choices including with their finances.

Investment strategies

A closer look at defensive assets for turbulent times

After the recent market slump, it's a good time to brush up on the defensive asset classes – what they are, why hold them, and how they can both deliver on your goals and increase the reliability of your desired outcomes.

Financial planning

Are lifetime income streams the answer or just the easy way out?

Lately, there's been a push by Government for lifetime income streams as a solution to retirement income challenges. We run the numbers on these products to see whether they deliver on what they promise.

Shares

Is it time to buy the Big Four banks?

The stellar run of the major ASX banks last year left many investors scratching their heads. After a recent share price pullback, has value emerged in these banks, or is it best to steer clear of them?

Investment strategies

The useful role that subordinated debt can play in your portfolio

If you’re struggling to replace the hybrid exposure in your portfolio, you’re not alone. Subordinated debt is an option, and here is a guide on what it is and how it can fit into your investment mix.

Shares

Europe is back and small caps there offer significant opportunities

Trump’s moves on tariffs, defence, and Ukraine, have awoken European Governments after a decade of lethargy. European small cap manager, Alantra Asset Management, says it could herald a new era for the continent.

Shares

Lessons from the rise and fall of founder-led companies

Founder-led companies often attract investors due to leaders' personal stakes and long-term vision. But founder presence alone does not guarantee success, and the challenge is to identify which ones will succeed in the long term.

Sponsors

Alliances

© 2025 Morningstar, Inc. All rights reserved.

Disclaimer
The data, research and opinions provided here are for information purposes; are not an offer to buy or sell a security; and are not warranted to be correct, complete or accurate. Morningstar, its affiliates, and third-party content providers are not responsible for any investment decisions, damages or losses resulting from, or related to, the data and analyses or their use. To the extent any content is general advice, it has been prepared for clients of Morningstar Australasia Pty Ltd (ABN: 95 090 665 544, AFSL: 240892), without reference to your financial objectives, situation or needs. For more information refer to our Financial Services Guide. You should consider the advice in light of these matters and if applicable, the relevant Product Disclosure Statement before making any decision to invest. Past performance does not necessarily indicate a financial product’s future performance. To obtain advice tailored to your situation, contact a professional financial adviser. Articles are current as at date of publication.
This website contains information and opinions provided by third parties. Inclusion of this information does not necessarily represent Morningstar’s positions, strategies or opinions and should not be considered an endorsement by Morningstar.