Pure, Concentrated RiskOver the past 10 years, a $10,000 investment in the S&P 500 would have grown to around $38,260. That’s based on the SPY ETF with dividends reinvested.But the tech-heavy Nasdaq 100 would have turned every $10,000 into $58,866 over the same period. That’s based on the QQQ ETF and also assumes dividends are reinvested.Historically speaking, these are abnormally high returns. Instead of the 8% per year long-term average, broad U.S. stock indexes have essentially doubled that (or more) ove ...