Wiped Out by One Crash? The Same Mistake Every Taiwan Retail Investor Makes: The Sandpile Effect
You poured three years of savings in last month, and this month your account is halved. It's not bad luck or a bad stock pick; your portfolio was already sitting at an invisible tipping point, waiting to collapse. This is the fatal investment blind spot proven by physicists in the sandpile experiment: highly correlated assets fall together in a crash. This article breaks down 3底层 rules, 3 calculations, 4 iron rules, and a 4-step action plan to help you design a portfolio you can keep holding even in the worst moments. Over 60% of Taiwan retail investors concentrate holdings in the electronics sector, with TSMC alone accounting for over 30% of the weighted index. Many investors mistakenly believe buying 10 semiconductor supply chain stocks is diversification, but those 10 stocks have a correlation coefficient near 0.9. The article covers maximum drawdown as the psychological breaking point, the correlation trap that destroys diversification in crisis, the hidden value of rebalancing, and a true comparison showing how NT$1 million lost 59% in the 2008 crash and needed six years to recover. Get a portfolio that lets you survive the avalanche.