Comment by matwood

There's also a great book: https://www.amazon.com/Man-Who-Solved-Market-Revolution/dp/0...

They lost money for a long time, and it was not easy building what they built. I really enjoyed the early parts where they were solving problems in creative ways like any startup. For example, they needed data so had people calling them each day reading off numbers and someone writing them to down to enter them later.

How the later part of the story ties to today's politics is also interesting.