Every long-term investor should consider having some exposure to growth stocks, companies that are rapidly growing their revenue and earnings. Even the most conservative investor can benefit from owning a high-quality exchange-traded fund that offers instant, diverse growth stock exposure with a single ticker symbol.

And as far as growth ETFs go, the Invesco QQQ Trust (NASDAQ: QQQ) is tough to beat.

I'll explain below why the Invesco QQQ is the best growth ETF you can buy under $500 and how best to implement it into your long-term investment strategy.

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Source Fool.com