The story specifically asks a question that none of the commenters have addressed yet.

"So," the Lord Pilot finally said. "What kind of asset retains its value in a market with nine minutes to live?"

My answer: Music.

If your world is going to end in nine minutes, you might as well play some music while you wait for the inevitable.

Short story collections, perhaps? If you've never read, say, "The Last Question", it would be your last chance. (And if you're reading this now, and you haven't read "The Last Question" yet, then something has gone seriously wrong in your life.)