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On Friday, Uber plans to list its share on the New York Stock Exchange, marking a unicorn’s first foray into the public market.

The move comes at the end of a long, bumpy road. (Forgive the pun.) But it’s also the start of a new era for the company.

I asked my colleague Mike Isaac, who wrote a book about the ride-hailing company, about what he’ll be watching:

Uber has come a long way since its early days in San Francisco, circa 2009, where it began as a smartphone-based black car service tailored to the Valley elite.

A decade later, Uber has moved far beyond its luxury roots, expanding into low-cost UberX rides, lower cost car-pooling, and other far-flung categories like bikes, scooters — even flying cars. The company hopes to raise as much as $9 billion in its I.P.O., giving it much more runway to burn oodles of cash as it invests in its future.