THE ETFs have established themselves as the star investment for savers: reduced feesease of access and performance often superior to traditional funds. THE MSCI Worldoften presented as the simplest investment for “investing anywhere in the world”, brings together approximately 1,500 large listed companies distributed in 23 developed countries. On paper, it gives the impression of a diversification broad and balanced. In reality, its weight remains largely dominated by American behemoths, particularly large technology stocks.
“ Many investors think that by purchasing a MSCI Worldthey are perfectly diversified. In reality, they are exposed to almost 75% to American stocks », recalls Arthur Mounier, wealth management advisor and founder of Cadre Privé.
Behind this heavy weighting are mainly large American capitalizations, particularly technology giants. A white paper published in April 2026 by seven French management companies, including Carmignac, Comgest and Moneta Asset Management, warns precisely of this increasing concentration. According to these actors, a significant part of global savings finds itself directed towards the same American values, to the detriment of real diversification and financing the European economy.
The first question to ask yourself: how long can you leave this money invested?
Before even choosing a ETFsso the real question is not which one to buy, but how long you can hold your investment without touching it.
“ As with any investment, whether financial markets or real estate, you must first determine your investment horizon. This horizon defines the level of risk that the investor is willing to take », Explains Arthur Mounier.
A Equity ETFs generally assumes a long horizon, often greater than five years. Over a short period of time, the volatility can quickly become difficult to bear. A market decline of 15 to 20% is nothing exceptional on the stock markets.
” There risk tolerance translates concretely into the level of volatility that the investor accepts in advance,” he explains. A cautious profile will therefore not build the same portfolio as an investor ready to accept more fluctuations to aim for more returns in the long term.
The three most common mistakes made by beginners
The first mistake is to confusing simplicity and security. Because an ETF is easy to buy, many assume it is automatically risk-free. This is false.
The second trap consists of investing all of your capital at once. Even if this is not necessarily less effective in the long term, the method can be psychologically difficult to bear in the event of a sudden correction.
“ The progressive investment strategy, the DCAis not necessarily more effective than a single investment, but it is much more reassuring. You should never underestimate the psychological aspect of investing “, underlines Arthur Mounier.
Third error: neglect the tax envelope. For a long-term investment, the choice between PEA, life insurance And securities account greatly changes the final profitability. The securities account remains subject to single flat-rate deduction of 30%while the PEA allows, after five years, an exemption from income tax on earnings (excluding social security contributions). L’life insurance also retains tax benefits after eight years.
Really diversify, not just in appearance
Buy one ETFs does not automatically mean diversifying one’s assets. You have to look at the actual composition of the product, not just its name. “ When you invest in an ETF, you agree not to outperform your benchmark », recalls Arthur Mounier. The goal is not to beat the market, but to replicate it.
To avoid overexposure to American securities alone, some CGPs recommend completing a MSCI World with ETF Europe, emerging markets Or small caps. This makes it possible to better distribute geographical and sectoral risk.
In other words, the diversification is not read on the label, but in the actual composition of the wallet. Before purchasing a ETFsthe most important question therefore remains the simplest: do you really know where your money is going?
