From lobsters, you can summarize a set of "excretion" dissemination speeds of technological information.

First Silicon Valley pulls ahead, then Shanghai and Shenzhen get a taste,
Next Beijing enjoys some semi-concentrated info,
Then inland cities like Chengdu can only sip some thin broth,
Finally, on the Loess Plateau and the vast grasslands, it's a state of disconnection and inaccessibility.
Before the AI era, many people relied on this information gap for arbitrage, but now it should be very difficult.