Martin Lewis just explained the stock market’s golden rule

Unlike cash, the stock market can quietly turn lump sums into serious wealth. So, what’s the secret sauce that makes this happen?

| More on:

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

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.

Bus waiting in front of the London Stock Exchange on a sunny day.

Image source: Getty Images

The stock market has had a fantastic run this year. As I write, the S&P 500 is up more than 16% while the FTSE 100 has returned around 23%, including dividends.

The performance of some household-name stocks has been even more spectacular. For example, Rolls-Royce is up 95%, while Lloyds has delivered a 75% return before dividends.

Shares of Google and YouTube parent Alphabet have jumped 61% year to date.

A dramatic difference

Last week, personal finance guru Martin Lewis highlighted the wealth-creating power of the stock market. In a presentation on his Martin Lewis Money Show, he showed that money held in cash savings accounts over the last 10 years would have actually lost value when inflation was factored in. 

To break even after a decade of inflation, someone would have needed £1,390 back from £1,000. But Lewis highlighted that even the best cash savings accounts would only have generated £1,270.

In contrast, over the same period, some index funds have significantly increased the initial investment. For example, £1,000 invested in the S&P 500 would now be worth about £3,790 (with reinvested dividends).

For some reason, Lewis’ presentation didn’t show the FTSE 100’s return. But the iShares Core FTSE 100 ETF has generated a total return of about 122% over the past 10 years, thereby turning every £1,000 invested into approximately £2,220.

Source: iShares.

Long-term mindset

So, what was the golden rule of investing that I think Lewis just highlighted? It was this: “Only invest what you won’t need for at least five years, after clearing expensive debts and building an emergency fund.”

This is crucial because shares can swing wildly from one year to the next. But investing over a five-year period — or ideally a decade or more, as shown above — should iron out these natural ups and downs.

While clearing expensive debts is self-explanatory, having an emergency fund is an often overlooked step towards building an investment pot. But this is important because having one drastically reduces the need to suddenly sell shares (possibly at a loss) to raise cash for emergencies.

As the late investor Charlie Munger once said: “The first rule of compounding: Never interrupt it unnecessarily.” 

Compounding is arguably an investor’s best friend, working its wealth-building magic over time. So it needs leaving alone.

FTSE 250 trust

Lewis said that risk-averse beginners should probably opt for funds like index trackers. I think high-quality investment trusts could also be worth considering in this case, particularly City of London Investment Trust (LSE:CTY). 

First launched in 1891, this FTSE 250 trust aims to provide long-term growth in both income and capital. It holds top UK shares like HSBC, Shell, Unilever, and NatWest, with the portfolio collectively offering a decent 4.12% dividend yield.

Incredibly, City of London has raised its annual dividend for 59 consecutive years. That’s because it “focuses on cash-generative businesses, able to grow their dividends“. This is the kind of deep stock analysis beginners can happily leave to the professionals. In fact, some experienced investors do as well!

Of course, as with every investment, there are risks. One is that lower interest rates might push investors out of steady dividend-payers and towards racier growth stocks. In this scenario, the trust could underperform for a while.

On balance though, I reckon this trust will do well over the next decade, likely leaving cash returns in the dust.

HSBC Holdings is an advertising partner of Motley Fool Money. Ben McPoland has positions in HSBC Holdings and Rolls-Royce Plc. The Motley Fool UK has recommended Alphabet, HSBC Holdings, Lloyds Banking Group Plc, Rolls-Royce Plc, and Unilever. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

DIVIDEND YIELD text written on a notebook with chart
Investing Articles

Down 15% and a yield of 7.9%! Is this REIT dividend champion now irresistible?

This real estate investment trust (REIT) has one of the highest dividend yields on the London Stock Market. Royston Wild…

Read more »

Mature black woman at home texting on her cell phone while sitting on the couch
Investing Articles

Down 32% and with a P/E of 9.5, is this FTSE 250 share too cheap to ignore?

This FTSE 250 share is in freefall after slashing guidance for this financial year. But Royston Wild eyes a potential…

Read more »

Chalkboard representation of risk versus reward on a pair of scales
Growth Shares

Why high oil prices could be good news for Lloyds shares

Jon Smith talks through the implications of elevated oil prices and translates that through to the potential impact on Lloyds'…

Read more »

Investing Articles

Lists of income stocks to buy almost never include this one — but with a forecast 8.2% yield, I think they should!

This FTSE firm, not always seen as an income play, has a forecast yield of 8.2%, underlining why it's one…

Read more »

Person holding magnifying glass over important document, reading the small print
Investing Articles

Aviva’s share price is down 13% to under £7, despite outstanding 2025 results! Time for me to buy more?

I think Aviva’s share price reflects an outdated view of the business, and that gap between perception and reality is…

Read more »

Arrow symbol glowing amid black arrow symbols on black background.
Investing Articles

Shell’s £33+ share price is near an all-time high, so why am I going to buy more as soon as possible?

Shell's strong cash generation and improving growth drivers contrast with a share price well below my valuation, suggesting major long‑term…

Read more »

DIVIDEND YIELD text written on a notebook with chart
Investing Articles

An 8.4% forecast yield but down 16%! Time for me to buy more of this FTSE 100 passive income star?

This FTSE 100 passive‑income machine is delivering rising payouts and strong forecasts, and its share price suggests the market hasn’t…

Read more »

CEO Mark Zuckerberg at F8 2019 event
Investing Articles

£10,000 invested in Meta Platforms Stock 5 years ago is now worth…

Meta Platforms has been throwing good money after bad at Reality Labs since 2021, but the stock has more than…

Read more »