The S 500 just reached an all-time high, but that doesn't mean that all stocks are expensive. There are some compelling opportunities -- especially in the technology sector -- that could be great long-term investments for those who buy now.

Here are two in particular that could be excellent investments for people who prefer to measure their returns in decades. I own both in my portfolio and plan to keep them for as long as their management teams keep their growth momentum alive.

For a while, Block (NYSE: SQ) appeared to have a somewhat disjointed growth strategy. That's changed. CEO Jack Dorsey and his team have refocused their efforts on their core businesses of Cash App and Square (still the name of the small business side). They're doubling down on efficiency, with moves like a cap on the number of employees and new cost controls.

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Source Fool.com