When it comes to investing, it's often said that "past performance does not guarantee future results." Just because a stock or exchange-traded fund (ETF) has performed well in the past doesn't mean it will be the best investment going forward. Investing is about the future. People constantly make decisions about where to put their money to work based on what they think will happen next, not what already happened. The tech-heavy Nasdaq-100 index is a good example. It has been one of the best investments of the past 10 to 15 years. During the past 10 years, the Invesco QQQ Trust (NASDAQ: QQQ), an ETF that tracks the Nasdaq-100, has delivered an average annual total return of 20.5%. "The Qs" ETF has strongly outperformed the S&P 500 (SNPINDEX: ^GSPC) during that time.
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