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Global stock markets have experienced a difficult week, with technology shares bearing the brunt of a sharp change in investor sentiment. After years of enthusiasm surrounding artificial intelligence, investors are beginning to question whether company valuations have moved too far ahead of future earnings.

The sell-off has raised an important question: is this a temporary correction, or an early warning that markets have become too optimistic?

The technology-heavy Nasdaq Composite fell approximately 4.5% over the week, while the broader S&P 500 declined around 1.9%. Friday alone saw the Nasdaq lose 2.1%, making it one of the most difficult trading sessions for US technology shares in several months.

Companies associated with artificial intelligence, semiconductor manufacturing and data-centre infrastructure have come under particular pressure.

However, this has not been a uniform global sell-off. The Dow Jones Industrial Average actually finished the week higher, while European markets proved more resilient.

Investors are not necessarily abandoning equities altogether. Instead, they appear increasingly selective about which companies deserve their money.

Two concerns are driving the uncertainty.

Firstly, the enormous investment required to develop artificial intelligence is attracting greater scrutiny. Technology companies are spending billions on computing infrastructure, but investors increasingly want evidence that these investments will generate sustainable profits.

Secondly, inflation and borrowing costs remain problematic.

Recent US inflation figures have reinforced concerns that interest rates could remain elevated, or even rise further. Higher borrowing costs can reduce the value investors place on future corporate earnings, particularly for rapidly growing technology businesses.

When investors are already paying high prices for expected future growth, even relatively modest changes in expectations can trigger significant share-price movements.

For investors holding global index funds, the effects can be difficult to avoid.

Many global equity funds have substantial exposure to America's largest technology companies. Consequently, weakness in a relatively small number of businesses can influence the performance of an otherwise diversified portfolio.

This is not necessarily a reason to abandon global investing. These companies remain highly profitable businesses, and artificial intelligence may still deliver substantial economic benefits over the coming decades.

However, a successful technology does not automatically make every company associated with it an attractive investment at any price.

Diversification across countries, sectors and company sizes remains an important way of managing that uncertainty.

Attention now turns to upcoming corporate earnings announcements, particularly from major technology companies.

Investors will be examining revenue growth, profitability and, crucially, whether spending on artificial intelligence is translating into meaningful financial returns.

Inflation figures and central bank expectations will also continue influencing market sentiment.

Further volatility is entirely possible, although predicting its direction is notoriously difficult.

My investment strategy remains unchanged.

Market corrections are uncomfortable, particularly when they affect some of the world's largest and most widely owned companies. Nevertheless, they are a normal feature of equity investing.

I remain focused on long-term ownership, regular contributions and maintaining exposure across different markets rather than trying to predict the next short-term movement.

The important distinction is between a company's prospects and the price investors are prepared to pay for them.

Artificial intelligence may well transform the global economy. That doesn't mean its shares can rise indefinitely.

For long-term investors, patience and diversification remain considerably more useful than attempting to anticipate every market correction.

So… sit tight, stick to the plan, this is the price we have to pay for long-term stock market returns. During times of volatility it is important to control your emotions. Try to ignore the noise and keep going.

Happy compounding!

The Compounder
Long-term investing made simple.

The Compounder is for financial education and commentary only. I am not authorised or regulated by the Financial Conduct Authority and I do not provide financial advice, investment advice, or personal recommendations. Nothing published here should be taken as a recommendation to buy, sell, hold or switch any investment, fund, pension, ISA, crypto asset or financial product. Always do your own research and consider speaking to an FCA-authorised financial adviser if you are unsure.