Emery tried to analyze and assess the situation he was currently in, hoping to make the most of his apothecary skill and make some more spirit stones out of it.
From what he saw and inferred, both [Spirit Pool Potion] and [Health Regeneration Pill] were quite a popular item. Although there were tons of similar products to compete with, they were in high demand in the market and hence made them a great product to sell.
This should be true as of the war that has been escalating, magus and saint alike would be using such products on a daily basis.
The [Reviving Pill], on the other hand, could be considered as a unique and niche item. In fact, it was quite fortunate for Emery to be able to sell all 100 pills he put on display in spite of his obscure shop and non-existent reputation.