S&P 500 vs MSCI World ETF: Which to Choose?
This is the most common debate among beginner investors in France. Both are available in a PEA via synthetic ETFs, both are solid choices — but they're not equivalent. Here's what the numbers actually say.
Quick Comparison
| Metric | S&P 500 | MSCI World |
|---|---|---|
| Number of companies | ~500 | ~1,500 |
| Geography | 100% USA | 23 developed countries |
| US weight | 100% | ~65% |
| Europe weight | 0% | ~15% |
| Japan weight | 0% | ~6% |
| 10-year annualised return | ~12–13% (USD) | ~10–11% (USD) |
| Volatility | Higher | Slightly lower |
| Typical ETF fees (TER) | 0.05–0.15% | 0.12–0.38% |
The S&P 500: 500 American Giants
The S&P 500 covers the 500 largest US-listed companies: Apple, Microsoft, Nvidia, Amazon, Alphabet, Meta, Berkshire Hathaway… It's been the global benchmark index for decades.
Its historical performance is exceptional: around 10–13% per year in USD over 20–30 years. It's heavily concentrated in tech (about 30–35% of the index) and mega-caps — the top 10 companies represent ~35% of the total index weight.
Main risk: total concentration in the US economy. If the US goes through a difficult decade (as in the 2000s), this index significantly underperforms.
MSCI World: 1,500 Companies, 23 Countries
The MSCI World covers developed global markets. Despite the name, it does not include emerging markets (China, India, Brazil…) — that's the MSCI ACWI. What MSCI World does is aggregate large and mid-cap companies across 23 developed countries.
Geographic diversification is real but US weight remains dominant at ~65%. When the S&P 500 drops, MSCI World drops too — less severely, but in the same direction.
The Overlap: The Key Point Most Investors Miss
This is where many investors go wrong. Holding both an S&P 500 ETF and an MSCI World ETF doesn't actually diversify.
Why? Because the 500 companies in the S&P 500 are already contained in the MSCI World (they represent 65% of that index). Combining both gives you a portfolio ~80% exposed to the US — with two ETFs instead of one.
If you want more diversification, holding both doesn't provide it. Better to pick one, or add a truly distinct exposure (Europe, emerging markets) with a third ETF if you actually want to diversify.
Performance Comparison
| Period | S&P 500 (EUR) | MSCI World (EUR) |
|---|---|---|
| 2015–2025 (10 years) | +12.5%/yr | +10.8%/yr |
| 2000–2010 (US lost decade) | -1.0%/yr | -0.5%/yr |
| 2010–2020 | +13.6%/yr | +11.3%/yr |
The S&P 500 has outperformed MSCI World over the past 15 years, largely driven by US tech dominance. But during the 2000s "lost decade," global diversification would have been protective.
The question isn't "which performed better over the last 10 years" but "which will hold up better over the next 20–30." Nobody knows — which is exactly why diversification makes sense.
ETFs Available in a PEA
Standard S&P 500 and MSCI World ETFs aren't PEA-eligible (they invest directly in non-European stocks). Synthetic ETFs exist to work around this — they replicate the indices via swaps while being legally domiciled in Europe.
| Index | ETF | Ticker | TER |
|---|---|---|---|
| MSCI World | Amundi MSCI World UCITS ETF (C) | CW8.PA | 0.38% |
| MSCI World | Amundi MSCI World II UCITS ETF | EWLD.PA | 0.12% |
| S&P 500 | Amundi PEA S&P 500 UCITS ETF | PE500.PA | 0.15% |
| S&P 500 | Lyxor PEA S&P 500 UCITS ETF | PSPX.PA | 0.15% |
Which to Choose?
There's no wrong answer. Two reasonable approaches:
- Maximum simplicity: MSCI World (EWLD for lowest fees). You capture the global developed economy without having to pick between regions.
- If you believe US dominance will continue: S&P 500 (PE500). You consciously accept concentrated US exposure in exchange for historically higher returns.
What not to do: hold both thinking you're diversifying.
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Start for free →Frequently Asked Questions
Does MSCI World include emerging markets?
No. MSCI World covers only 23 developed markets. To include emerging markets (China, India, Brazil, etc.), you need an MSCI ACWI ETF or a separate emerging markets ETF. For a beginner, MSCI World alone is more than sufficient.
CW8 vs EWLD: what's the difference?
Both track MSCI World and are PEA-eligible. The main difference is the TER: CW8 (0.38%) vs EWLD (0.12%). Over 20 years with €50,000 invested, the fee difference represents several thousand euros. EWLD is generally preferable for new positions.
Can I switch ETFs (sell CW8, buy EWLD) inside a PEA?
Yes. Internal transactions within a PEA don't trigger any tax — you only pay tax when money leaves the PEA. You can freely sell one ETF and buy another without immediate tax consequences. Just watch out for trading fees accumulating if you do it too often.