Han Jiaxue quickly zeroed in on several feasible trades, primarily involving product exchanges. Many lower civilizations, below level 10 in the interstellar hierarchy, tried their luck on commercial planets like Bupinga Star. They often sold a large quantity of low-technology, low-added-value products, or even directly traded some resources, to get a small amount of Pulun. Then, they would attempt to exchange for high-technology products from higher-level civilizations.
These high-technology products could potentially make the lower civilizations more powerful; if they were lucky enough to reverse-engineer them or gain inspiration, their civilizational level could even increase.
Naturally, such occurrences were not very common; thus, commercial planets like Bupinga Star remained a feasting ground where high-level civilizations exploited lower civilizations.
Fortunately, the Iridium Star Earth civilization was an exploiter here, not the exploited.