How to Haggling?
You need to click as many yellow areas as fast as possible. It’s really quick-time, no waiting for the slider to go back and forth. No waiting – only clicking!
The symbols doesn’t matter.
Also, the scale works backwards: if your side (right side) of the scale rises you’re doing it correctly.
Technically you keep clicking until the dish on the customer/merchant side hits the bottom cause it means it has been loaded with gold so you’re gaining more.