What are QQQ stocks/ETFs exactly? Like, why 'QQQ'? What do the Q's represent or where do they come from? - Quora

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Should I invest in PowerShares QQQ Trust ETF (NASDAQ: QQQ)? Historical data shows it outperforms S&P500. - Quora

Should I invest in PowerShares QQQ Trust ETF (NASDAQ: QQQ)? Historical data shows it outperforms S&P500. - Quora

What are some alternatives to the QQQ ETF? - Quora

Better Buy: QQQ vs. VOO

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