Is it a bad idea to pair long term investment equities with their competitors? (example: Buy Visa and Mastercard; Pepsi and Coke; Ford and GM)

It seems, for long term investing, they usually seem to rise together.

Why not just buy both?

Is there a name for this kind of investing so I can research it more?

Thoughts?

Submitted March 03, 2018 at 10:28AM by marfalump http://ift.tt/2teNSTx