These companies are helping build the future, and despite near-term issues, could be much better off in five years.

One way to earn strong returns over the long run is to invest in stocks that are leaders or pioneers (or both) in industries experiencing significant growth due to technological progress or other developments. That description applies to PayPal ( PYPL 0.20% ) and Fiverr ( FVRR 2.15% ) pretty well. The former is a well-established fintech specialist, while the latter is helping power the expanding gig economy. Although they have faced their challenges -- PayPal is down 19% this year, while Fiverr has dropped 26% -- these two stocks could deliver excellent returns over the long run.

1. PayPal

PayPal's second-quarter results were in line with expectations, exc

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