Over 30 years (1996-2026), dividends reinvested, the CAC 40 returned ~5.5%/year vs ~9%/year for the S&P 500. The gap comes from sector weighting: CAC is dominated by luxury, energy, pharma and banks. The S&P 500 has US tech (Apple, Microsoft, Nvidia, Alphabet, Meta) that drove returns.
On the other hand, during correction phases (2000, 2008, 2022), the CAC often proves more defensive thanks to moderate cyclical names and generous dividends (~3-3.5%/year yield vs ~1.5% for S&P 500).
Typical mixed strategy: core exposure via a World ETF like MSCI World (captures US ecosystem) + CAC 40 satellite for European dividend yield (PEA-eligible).