I assume that brokers know other brokers, and those working for the same company (TransWorld, Murphy, Sunbelt etc.) all have a database where they can share notes on buyers.

How much does this typically impact their communication and engagement with buyers?

Like for example, if a buyer breaks a deal or does something stupid, do brokers have some way where they warn other brokers not to take that buyer seriously?

I've always wondered about that... what's going on behind the scenes with brokers?