The commercial trade in Thousand Star Immortal City was incredibly developed, with shops of every shape and color as plentiful as the hairs on a cow.
Although there weren't many merchants among the neighbors coming to offer congratulations, they all had a mental ledger from long-term exposure to such transactions, plus the needs of life, work, and cultivation.
They had a clear understanding of the appropriate price range for items of any given tier.
Wang Chen displayed Magic Artifacts and Spiritual Artifacts on the shelves, 90% of which were of medium to high quality, with about 10% being of the finest quality. The prices were clearly marked, basically at 80% of the market rate!
You should know that because of the intense competition, prices for Magic Artifacts, Pills, Talismans, etc., sold in the shops of Thousand Star Immortal City were not only transparent but also highly stable.
It was rare for one shop to charge 100 Spirit Stones for an item, while another charged only 80.