Chinese walls are regulatory information barriers that aim to stop the flow of information that could be misused, especially in financial corporations.
(UK) When a story is told from person to person, especially if it is gossip or scandal, it inevitably gets distorted and exaggerated. This process is called Chinese whispers.
If something is sold by setting a price, then reducing it until someone buys it, it is sold in a Dutch auction. It can also mean that something is changed until it is accepted by everyone.