As the seller, you're in complete control of how you price your book, and if you choose to adjust the price. PangoBooks will never adjust the price for you.
If you're unsure where to start, we recommend looking at similar listings available on PangoBooks, and pricing similar to those listings. A good place to start is about 60% of the retail price, adjusting as needed if you're not selling as quickly as you want!
Pricing also depends on the condition of the book, with "New" and "Like New" listings most likely being priced higher than listings that are considered "Fair" or "Poor." Hardcover books are also typically priced higher than paperbacks.
These are just some suggestions if you're unsure where to begin with pricing, but how to price your books is completely up to you as the seller.