This stock market investment strategy made money 100% of the time over the last century

Patient investors can build tremendous wealth in the stock market with very little work.

A businessman stacks building blocks.

Image source: Getty Images

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More

This article was originally published on Fool.com. All figures quoted in US dollars unless otherwise stated.

Countless factors affect stock prices on a daily basis. Some are very broad like global events and macroeconomic trends. Others are more narrow: company-specific news or changes to analyst price targets. But all of those things affect investor sentiment to some degree, making it impossible to predict which direction a stock (or even the broad market) will move in the short term.

You may hear stories about day traders who made a fortune overnight. Well, some lucky people have also become millionaires by playing the lottery, but that doesn't mean you should invest your money in lottery tickets. Several studies have shown the vast majority of day traders actually lose money, and the ones who manage to turn a profit often make less than minimum wage.

Put simply, the best way to make money in the stock market is a long-term investment strategy. For instance, the S&P 500 has produced a positive return 100% of the time over any 20-year window between 1919 and 2021, according to Crestmont Research. That means patient investors who held an S&P 500 index fund for at least two consecutive decades (at any point over the last century) always made money.

Here is one way to benefit from that information.

A simple way to make money in the stock market

The Vanguard S&P 500 ETF (NYSEMKT: IVOO) is a passively managed fund that tracks the performance of the S&P 500, which includes 500 of the largest U.S. companies. That may be less exciting than buying individual stocks, but there are several advantages to this strategy investors should consider.

First, the Vanguard S&P 500 ETF offers instant diversification across all 11 market sectors, and investors get exposure to some of the most valuable brands in the world. For instance, the top 20 holdings include industry-leading names like Apple, Inc. (NASDAQ: AAPL), Microsoft Corporation (NASDAQ: MSFT), Amazon.com, Inc.(NASDAQ: AMZN), The Home Depot, Inc.(NYSE: HD), Mastercard Incorporated(NYSE:MA), Visa Inc. (NYSE: V), UnitedHealth Group (NYSE: UNH), Johnson & Johnson (NYSE: JNJ), Tesla Corp Ltd (NASDAQ: TSLA), Alphabet Inc. (NASDAQ: GOOG) (NASDAQ: GOOGL), and ExxonMobil Corporation (NYSE: XOM).

Second, the Vanguard S&P 500 ETF is cheap and time-efficient. It bears an expense ratio of 0.03%, meaning investors would pay only $1.50 per year in fees on a $5,000 portfolio. Additionally, it requires very little work, because there is no need to research specific companies or stay up to date on financial results. Investors can simply buy the ETF and forget about it.

In short, while it may be boring, buying an S&P 500 index fund is a simple, inexpensive, and time-tested path to making money in the stock market. That's why Warren Buffett has often advocated for this investment strategy.

Third, the Vanguard S&P 500 has generated a total return of 206% over the last decade, which is equivalent to an annualized return of 11.8%. At that pace, $100 invested on a weekly basis would grow into a $1 million portfolio in 28 years, and it would grow into a $2 million portfolio in 34 years.

How I manage my portfolio

An S&P 500 index fund does not have to be your only investment. Personally, I keep a certain percentage of my portfolio in the Vanguard S&P 500 ETF, but I also own dozens of individual growth stocks. I think of the S&P 500 index fund as a sort of safety net, a reliable money maker in the long run.

Of course, nothing is truly guaranteed when it comes to the stock market, but the S&P 500 has undeniably produced a positive return over every rolling 20-year period since 1919. And that knowledge makes me feel comfortable taking a little more risk with my other investments.

This article was originally published on Fool.com. All figures quoted in US dollars unless otherwise stated.

Suzanne Frey, an executive at Alphabet, is a member of The Motley Fool’s board of directors. John Mackey, CEO of Whole Foods Market, an Amazon subsidiary, is a member of The Motley Fool’s board of directors. Trevor Jennewine has positions in Amazon, Mastercard, Tesla, Vanguard S&P 500 ETF, and Visa. The Motley Fool Australia's parent company Motley Fool Holdings Inc. has positions in and has recommended Alphabet (A shares), Alphabet (C shares), Amazon, Apple, Home Depot, Mastercard, Microsoft, Tesla, and Visa. The Motley Fool Australia's parent company Motley Fool Holdings Inc. has recommended Johnson & Johnson and UnitedHealth Group and has recommended the following options: long March 2023 $120 calls on Apple and short March 2023 $130 calls on Apple. The Motley Fool Australia has recommended Alphabet (A shares), Alphabet (C shares), Amazon, Apple, and Mastercard. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Scott Phillips.

More on International Stock News

a man sits at a bar leaning sadly on his basketball wearing a US flag sticker on his cheekbone near a half drunk beer and looking despondent as though his basketball team has just lost a game.
International Stock News

The Dow Jones is on its longest losing streak in 46 years. What's going on?

The Dow is on a losing streak in the middle of a boom.

Read more »

A person leans over to whisper a secret to a colleague during a meeting.
International Stock News

Despite recent news, analysts still say Nvidia stock is a buy. Here's why

Last month, Nvidia was the most valuable company in the world.

Read more »

A young girl looks up and balances a pencil on her nose, while thinking about a decision she has to make.
International Stock News

After gaining 2,100%, is Nvidia stock done?

Nvidia has taken off as one of the key players in chips and services for artificial intelligence.

Read more »

A young couple in the back of a convertible car each raise a single arm in the air whilst enjoying a drive along the road.
International Stock News

Why Tesla stock just jumped again

Wedbush's Dan Ives thinks the stock will keep moving higher thanks to Tesla's self-driving technology.

Read more »

An older couple hold hands as they bounce happily high in the air.
International Stock News

Why the Alphabet share price just leapt higher

Investors seem to hope the Trump administration will be friendly to Alphabet and its big-tech peers.

Read more »

A panel of four judges hold up cards all showing the perfect score of ten out of ten
International Stock News

Top Wall Street analyst calls Tesla stock a top pick. Is it a buy now?

Tesla shares have been on fire lately, rising more than 70% since the November 5 election.

Read more »

a couple clink champagne glasses on board a private aircraft with gourmet food plates set in front of them. They are wearing designer clothes and looking wealthy.
International Stock News

Billionaires love this US tech stock (Hint: It's not Nvidia)

Looking for the next big thing in tech investments? Several billionaire-owned hedge funds are heavily invested in one overlooked AI…

Read more »

Woman using a pen on a digital stock market chart in an office.
International Stock News

Is this Warren Buffett stock a smart buying opportunity?

This financial services company is flying under the radar right now. Is it a smart buy?

Read more »