How Index-Fund Investing Turned Into an Extreme Sport - WSJ
1. ETFs are increasingly concentrated in fewer stocks, increasing investment risks. 2. Apple, among other tech giants, benefits from leveraged single-stock ETFs. 3. New ETF trends bring higher volatility and potential extreme returns or losses. 4. Investing habits show a shift toward riskier, narrower strategies amid growing speculation. 5. Concentrating portfolios can lead to substantial financial risk and losses.