Diversification
Spreading money across many companies, countries and asset types to reduce the risk of any single loss.
A world index fund holds thousands of companies. Diversification lowers risk without lowering expected return.
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Investing
Investing in Switzerland: broad ETFs, domicile and fees
A plain guide to a low-cost portfolio from Switzerland: why broad index funds, how fund domicile affects withholding tax and what fees do over 30 years.