5 ideas
Before costs, all active investors together hold the market and so earn the market return; after fees, trading costs and taxes, the average active euro must therefore trail a cheap index fund. The minority that beats the index in one period cannot be reliably identified in advance, because past outperformance barely persists beyond what chance would produce.
In the German-speaking market, most bank and insurance 'advice' is sales. The adviser earns commissions, front-end loads and ongoing kickbacks from the products recommended. Seen this way, recommendations of expensive active funds, endowment policies and structured products follow the adviser's pay structure, not the client's interest.
The main lever an investor controls is the ratio between the risky part of the portfolio (equities) and the low-risk part (short-term, high-quality government bonds or deposits). Risk tolerance should be set through this split, not by picking 'safer' stocks or funds. The low-risk part exists to dampen volatility, not to earn return.
Professional forecasts of stock indices, interest rates and currencies are no more accurate than naive extrapolation. Acting on them adds trading costs and the risk of missing the few best days that deliver much of long-run returns. Disciplined buy-and-hold with periodic rebalancing beats tactical moves for nearly all investors.
An annual cost gap of one to two percentage points looks trivial but compounds over decades into a loss of a quarter to a third or more of terminal wealth. Because costs are certain and outperformance is not, total expense (TER, loads, trading and tax drag) is the single most reliable predictor of an investor's net result.