What if you could only own one stock forever? My pick for a single-stock portfolio might surprise you.

Let's make this clear from the start: I would never recommend owning just one stock for the long haul.

A proper nest egg needs some variety, either in a carefully assembled basket of diverse stocks or focused on a broad market-tracking exchange-traded fund ( ETF ). For the sake of argument, however, I could imagine buying some Berkshire Hathaway ( BRK.A 0.95% ) ( BRK.B 1.11% ) stock and just letting it roll.

The usual suspects aren't diverse enough for this challenge

I know, I know. You wanted me to double down on Amazon ( AMZN 2.77% ) , whose stock has absolutely crushed the general market in the long run. Or I could have picked Netflix ( NFLX -0.67% )

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