Barter System

As the afternoon wore on, the bustling activity in the store had settled into a steady rhythm.

Eventually, the Daily Tasks had been filled in with repeat customers bringing in their fellow disciples as new customers. Furthermore, curious citizens of the city had also started checking out the store. Unfortunately, most of them were mortals who didn't have any spirit stone in their possession. They produced gold coins that the system couldn't accept.

Those coins were just pieces of useless metals minted as a form of currency for mortals, after all. Spirit stones, on the other hand, contained spiritual energy and were the more common currency in the Realm of Nine Heavens.