Finding Material Traders and Technology Brokers
Since the Galaxy Map makes finding traders and brokers hard until you've "discovered" them, here are some efficient aids:
Raw Material Trader : Extraction/Refinery economy.
Manufactured Material Trader : Industrial Economy
Data Trader : High-Tech/Military
Guardian Tech Brokers : High-tech economy.
Human Tech Brokers : Industrial economy.
While honking a system will not reveal traders or brokers, scanning the Nav Beacon will. This could be a fast way to build your stable of discovered traders, making your Galaxy Map more useful over time.
If you have not scanned the Nav Beacon, a station's trader or broker is discovered simply by docking there and entering Station Services.