In the taxi economy one founder's family always ends up owning the city. When is that decided? This page runs an economy, rewinds it to earlier hours of its first day, and replays each rewind with fresh random noise. If the same family wins almost every replay from some hour on, the outcome was already decided then. The method is Gould's "replaying the tape of life", as Blount, Borland and Lenski ran it on bacteria. Everything runs here, in your browser.
replays won (over half the cars) 95% interval the family's share of the cars at that hour