Not long ago I was coming back from a haircut, a rare trip for me outside the New York Stock Exchange, and I heard a man’s voice calling me from the curb just behind Fearless Girl, a sculpture by the artist Kristen Visbal that I never fail to grin at when she catches my eye.

“Jim, can I shake your hand?” the man asked.

One day I will get over the fact that nice people want to stop and talk to me, tell me how they are doing in the market or how much they like “the show.” I always have time to say hello or give a fist pump, even a hug if demanded.

This time, it was a man named Jeremy, who said, “I want to show you something.” His wife said, “It’s something that has allowed me to retire.” Jeremy opened an app filled with stock listings, and he jabbed one line, a line that said “ Nvidia ,

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